VectorHeavy is a free air traffic control simulator in your browser.

St. Louis Lambert Intl: the template field, three parallels over the Mississippi. A steady shift to learn the board. Steady tier.

Spirit of St. Louis: St. Louis' business-aviation front door. Fractional jets, trainers, and transient GA share two close parallels beneath the Bravo. Busy tier.

St. Louis Regional: the metro's northeast corporate reliever. West Star maintenance jets and local GA share two long crossing runways beside the Mississippi. Steady tier.

Scott AFB / MidAmerica St. Louis: an Air Force mobility base and a civil terminal on one airfield. Tankers and transports share two far-spaced parallels with Allegiant, and now and then everything waits on a VIP movement. Busy tier.

St. Louis Downtown: the Mississippi-side business and training reliever. Corporate arrivals and a deep GA pattern share two close parallels and a short crosswind beneath the Bravo. Busy tier.

Kansas City Intl: a Southwest focus city on the Missouri River bluffs. Two long parallels and a crosswind, with the Center's own metro traffic. Busy tier.

Wichita Eisenhower National: the Air Capital's Class C approach seat. Regional airline banks over a heavy Textron and Spirit factory bizjet base, with two parallels and a crosswind. Steady tier.

Tulsa International: Green Country's Class C approach seat and American's world maintenance base. American-led regional banks over a corporate bizjet base, two parallels plus a crosswind, and the one published Tulsa arrival. Steady tier.

Springfield-Branson National: two equally busy runways cross at the Ozarks' regional gateway. Airline and cargo jets share the Class C with a deep GA and training stream. Steady tier.

Joplin Regional: SkyWest regional jets cross a GA-majority tower, with two equal-length crossing runways and no published route structure. Steady tier.

Branson: one precision runway cut into the Ozark hills, with resort-bound business traffic and GA but no current scheduled airline service. Steady tier.

Central Illinois Regional: regional jets, Allegiant leisure flights, FedEx cargo, and prairie GA share two crossing runways at Bloomington-Normal. Steady tier.

General Downing - Peoria International: Central Illinois' crossing-runway mix of regional jets, Allegiant, UPS, daily Guard Hercules traffic, and flight-school GA. Busy tier.

Waynesville-St. Robert Regional / Forney Field: Contour regional jets and Army traffic share one precision runway on the Fort Leonard Wood installation. Steady tier.

Rosecrans Memorial: a Missouri River Guard field where Hercules tactical training and municipal GA share a long primary and a short assault-strip crosswind. Busy tier.

Topeka Regional: Forbes Field's 12,800-foot primary carries Guard tankers and transient military traffic over a mixed civil and GA operation. Busy tier.

Salina Regional: daily regional jets share a former Air Force runway complex with military transients, corporate traffic and a deep university training pattern. Busy tier.

Philip Billard Municipal: Topeka's close-in municipal tower, where corporate arrivals and a deep GA pattern share two short crossing runways beside the Kansas River. Steady tier.

Manhattan Regional: daily American regional jets to Dallas and Chicago share a Kansas River tower with Fort Riley-adjacent GA and a short crosswind. Steady tier.

Hutchinson Regional: three crossing runways and a GA-heavy corporate board beside the Arkansas River, with Wichita Approach working the outside airspace. Steady tier.

Garden City Regional: two daily American departures share two crossing runways with western Kansas GA, corporate, cargo and military traffic. Steady tier.

Beech Factory: Beechcraft factory flying, corporate jets and extensive training share one long runway beneath Wichita Approach. Steady tier.

Tulsa Riverside: Tulsa's busy GA reliever, with trainers and corporate jets working close parallels and a short crosswind runway. Busy tier.

Stillwater Regional: Oklahoma State training traffic and regional airline service share a long ILS runway with a crossing strip. Steady tier.

Enid Woodring Regional: Vance military training dominates a long ILS runway, with civil GA and a short crosswind strip underneath. Busy tier.

Southern Illinois: Southern Illinois' high-training tower. Student pattern work and business GA share three intersecting runways beside the Mississippi corridor. Steady tier.

Veterans Airport of Southern Illinois: Southern Illinois' commercial gateway. Contour regional jets to Chicago share crossing runways with local and business GA. Steady tier.

Kansas City Downtown: downtown Kansas City's bizjet front door, on a peninsula inside a Missouri River bend. Fractional jets and GA share crossing runways under the metro's satellite arrivals. Steady tier.

Johnson County Executive: the metro's training strip, a single 4,097 ft runway on the Johnson County upland. Pattern work all day with a light-jet sliver, the gentlest seat in the KC trio. Steady tier.

New Century AirCenter: the old Olathe naval air station, now the metro's southwest reliever. Training and transient GA on the crossing runways, bizjets on the 7,339 ft strip. Steady tier.

Columbia Regional: mid-Missouri contract tower. GA majority with a few daily regional jets to sequence in. Steady tier.

Jefferson City Memorial: a contract tower on the Missouri River. GA, bizjets, and a busy pattern; the runway is always yours. Steady tier.

Abraham Lincoln Capital: central-Illinois level-4 tower. Eagle RJs, Allegiant and Breeze over a prairie of GA and pattern traffic. Steady tier.

Indianapolis International: two long parallels carry a broad airline mix while the country's second-largest FedEx hub builds cargo banks beside them. Heavy tier.

Louisville Muhammad Ali International: UPS Worldport freight banks and airline traffic share two parallels beside the Ohio, with Guard Hercules traffic mixed in. Heavy tier.

Cincinnati/Northern Kentucky International: three north-south parallels and a crosswind runway, with passenger banks threaded through Amazon and DHL cargo waves. Heavy tier.

John Glenn Columbus International: two east-west parallels carry a broad airline mix, regional jets, cargo and Ohio business traffic. Busy tier.

James M. Cox Dayton International: a three-runway Class C tower mixing regional airlines, Allegiant leisure traffic, cargo, and southwest Ohio GA. Steady tier.

Anderson Regional: a high-training Indiana GA tower where charter and business traffic share a primary ILS runway and short crosswind. Steady tier.

Columbus Municipal: a former Air Force field where corporate traffic, trainers and transient GA share two long crossing runways. Steady tier.

Evansville Regional: the Tri-State's Class C gateway, with regional jets, Florida leisure flights and GA sharing a long primary beside the Ohio River. Steady tier.

Tri-State/Milton J. Ferguson Field: one ridge-top runway mixes regional airline and Allegiant arrivals with Appalachian business and general aviation traffic. Steady tier.

Terre Haute Regional/Hulman Field: two long crossing runways carry university training, corporate and general aviation beneath a 24-hour approach facility. Busy tier.

Wilmington Air Park: Ohio's cargo-focused air park puts 767 freight and maintenance traffic onto one active precision runway beside a closed parallel. Busy tier.

Blue Grass: central Kentucky's Class C mixes regional airlines, Allegiant, horse-country business aviation and training. Busy tier.

Bowman Field: Louisville's close-in GA reliever, with trainers, business aircraft and two crossing strips beside the Ohio. Steady tier.

Cincinnati Municipal Airport/Lunken Field: Cincinnati's close-in GA field, where business jets and trainers work two crossing runways beneath the Class B. Steady tier.

Delaware County Regional Airport: Muncie's long calm-wind runway mixes training traffic, local GA and business aircraft without airline service. Steady tier.

Ohio State University Airport: university flight training, local GA and business aircraft share three strips northwest of Columbus. Steady tier.

Owensboro/Daviess County Regional Airport: Essential Air Service, military training and Kentucky GA share an 8,000-foot north-south runway and crossing pavement. Steady tier.

Mid-Ohio Valley Regional Airport: Essential Air Service and Appalachian GA share a long ILS runway, a displaced threshold and crossing pavement. Steady tier.

Bolton Field Airport: a single ILS runway west of Columbus mixes flight training, banner activity, local GA and business aircraft. Steady tier.

Rickenbacker International: long parallel runways where international freight, military lift and leisure traffic share the sequence. Busy tier.

West Virginia International Yeager: One hilltop runway, regional jets and leisure arrivals sharing the sequence. Steady tier.

Monroe County: A college-town tower: trainers in the pattern, business arrivals on the long runway. Steady tier.

Pittsburgh International: three long east-west parallels, a crosswind runway, military traffic and a deep airline mix under Pittsburgh's Class B. Heavy tier.

Detroit Metropolitan Wayne County: Delta banks across four north-south parallels, with outboard arrivals and inboard departures. Heavy tier.

Cleveland-Hopkins International: two long northeast-southwest parallels, a crossing runway and a varied passenger bank on the Lake Erie shore. Busy tier.

Buffalo Niagara International: Lake Erie gateway with a long 5/23 primary and a shorter crossing wind runway. Busy tier.

Frederick Douglass Greater Rochester International: crossing instrument runways and a varied airline board under Rochester Approach. Busy tier.

Wheeling Ohio County: Wheeling Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Arnold Palmer Regional: Palmer Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Morgantown Municipal/Walter L. Bill Hart Field: Morgantown Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Beaver County: Beaver County Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Niagara Falls International: Niagara Tower mixes sourced airline connections, GA and business aircraft across surveyed runways. Steady tier.

Cuyahoga County: County Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Coleman A. Young Municipal: Detroit City Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Jackson County-Reynolds Field: Jackson Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Cape Girardeau Regional: Contour regional jets share two crossing runways with a growing flight-school and GA pattern beside the Mississippi. Steady tier.

Springdale Municipal: Arkansas' busiest municipal airport, where flight-school patterns and business traffic share a single runway in the Ozarks. Busy tier.

Nashville International: Three parallel streams, Southwest turns and the occasional transatlantic heavy. Busy tier.

Fort Smith Regional: airline arrivals, business aviation and military training meet on a long instrument runway at the Arkansas-Oklahoma edge. Busy tier.

Drake Field: Northwest Arkansas business traffic and an expanding flight-school pattern share one runway in the Ozarks. Busy tier.

Greenville Mid-Delta: Regional service and local GA share close parallel runways in western Mississippi, but only the long primary accepts air-carrier operations. Steady tier.

Golden Triangle Regional: Delta and American regional jets share a long precision runway with Mississippi business and training traffic. Steady tier.

Greenwood-Leflore: western Mississippi GA and business traffic work two crossing runways at a former wartime training field. Steady tier.

Hawkins Field: Jackson's close-in general-aviation field works crossing runways beside the Pearl River under Jackson Approach. Steady tier.

Jackson-Medgar Wiley Evers International: Jackson's airline gateway works two equal-length parallel runways under its own Class C approach control. Busy tier.

Tupelo Regional: a contract tower where Contour's thin regional schedule shares one long runway with Mississippi GA. Steady tier.

Frederick W. Smith International/Memphis: FedEx heavies and passenger jets share three north-south parallels beside the Mississippi, with wake spacing setting the rhythm. Heavy tier.

Key Field: Key Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Minneapolis-Saint Paul International: Delta's northern fortress, two parallel streams, and the 17/35 cross-flow make a cold-weather hub with real runway-use character. Heavy tier.

Eppley Airfield: paired 14R/32L and 14L/32R runways with a crossing 18/36, Southwest and GA traffic. Busy tier.

Des Moines International Airport: intersecting 5/23 and 13/31 strips, six passenger carriers and a mixed Iowa approach board. Busy tier.

Anoka County-Blaine (Janes Field): Anoka Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Appleton International: Appleton Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Central Nebraska Regional: Grand Island Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Central Wisconsin: CWA Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Chippewa Valley Regional: Eau Claire Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

La Crosse Regional: La Crosse Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Marquette Sawyer Regional: Sawyer Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

St. Cloud Sky Central: St Cloud Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

George Bush Intercontinental/Houston: United's Houston hub, with three east-west arrival runways and two diagonal departure runways in each published flow. Heavy tier.

Austin-Bergstrom International: two north-south parallels, with a 12,250-foot western strip and a wide domestic airline network. Heavy tier.

San Antonio International: long crossing instrument runways and an airline mix anchored by Southwest in South Texas. Busy tier.

Louis Armstrong New Orleans International: a long river-side 11/29 carries every movement during the 02/20 rehabilitation, with Gulf Coast airline traffic on one strip. Heavy tier.

Corpus Christi International: two instrument runways, regional connections and a lively GA mix on the Gulf Coast. Busy tier.

William P. Hobby: Hobby Tower mixes Southwest jets and business arrivals across intersecting Houston runways. Busy tier.

Sugar Land Regional: A single runway mixes Houston-area corporate arrivals and GA at Sugar Land Tower. Steady tier.

Conroe / North Houston Regional: Crossing runways mix Conroe training and business arrivals under a contract tower. Steady tier.

David Wayne Hooks Memorial: Hooks Tower mixes business aviation and training on the modeled main runway. Steady tier.

Ellington: Ellington Tower handles modeled civilian GA beside NASA and military tenants on three surveyed runways. Steady tier.

Baton Rouge Metropolitan / Ryan Field: Baton Rouge Approach mixes regional jets and GA across intersecting runways near False River. Steady tier.

Lafayette Regional / Paul Fournet Field: Lafayette Approach mixes regional connections and GA across crossing runways near Lake Peigneur. Steady tier.

Alexandria International: Alexandria Tower mixes regional jets and GA on two crossing runways east of Cotile Lake. Steady tier.

Easterwood Field: Easterwood Tower mixes American connections and GA on crossing runways beside the Brazos. Steady tier.

Jack Brooks Regional: Beaumont Tower mixes American connections and GA across intersecting runways beside Sabine Lake. Steady tier.

Lake Charles Regional: Lake Charles Approach mixes American and United connections over crossing runways near Calcasieu Lake. Steady tier.

Chennault International: Chennault Tower works business jets and GA on one long runway north of Calcasieu Lake. Steady tier.

Houma-Terrebonne: Houma Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Lakefront: Lakefront Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Gulfport-Biloxi International: Gulfport Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Mobile Regional: Mobile Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Mobile International: International Tower mixes GA and business aircraft across surveyed runways. Steady tier.

San Francisco International: parallel arrivals over the bay, crossing departure banks and a United-Alaska hub under NorCal Approach. Heavy tier.

San Jose Mineta International: two 11,000-foot parallels with published preferred arrival and departure sides in Silicon Valley. Busy tier.

Sacramento International: two north-south parallels, a Southwest-heavy bank and a nighttime north-flow preference. Busy tier.

Oakland San Francisco Bay Airport: a 10,520-foot airline runway beside three shorter strips and a Southwest-heavy Bay Area bank. Busy tier.

Reno/Tahoe International Airport: north and south parallel flows fill a high-desert valley board. Busy tier.

Miami International: three east-west runways, a crossing 12/30, American's hub and a deep international cargo mix. Heavy tier.

Tampa International: two north-south parallels and a short crosswind runway put Tampa Bay's airline banks under one Class B scope. Heavy tier.

Fort Lauderdale/Hollywood International: two east-west parallels, Miami Approach and a reshaped airline mix on the Atlantic coast. Heavy tier.

Southwest Florida International: one 12,000-foot runway, vacation-market banks and a runway 24 nighttime noise preference. Busy tier.

Orlando International: four north-south runways and a preferred south flow make Orlando's visitor banks a parallel-stream challenge. Heavy tier.

Jacksonville International: crossing 08/26 and 14/32, mixed passenger and cargo traffic, and two directional flows. Busy tier.

Charleston International: a shared-use Class C field with long precision 15/33 and a crossing 3/21. Busy tier.

Columbia Metropolitan: Regional jets and GA meet across two crossing runways in South Carolina's capital. Busy tier.

Pensacola International: Pensacola Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Dothan Regional: Dothan Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Southwest Georgia Regional: Albany Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Gulf Shores International / Jack Edwards Field: Gulf Shores Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Tallahassee International: Tallahassee Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Valdosta Regional: Valdosta Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Hilton Head: Hilton Head Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Savannah/Hilton Head International: Savannah Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Florence Regional: Florence Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Grand Strand: Strand Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Myrtle Beach International: Myrtle Beach Approach mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Hartsfield-Jackson Atlanta Intl: five parallels, a Delta fortress, the world's busiest. Heavy flows all day. Heavy tier.

Charlotte Douglas International: American's second-largest hub, three parallel runways and freshly redesignated pavement under Charlotte Approach. Heavy tier.

Asheville Regional: A single-runway airline and GA sequence in the Blue Ridge, with terrain explicitly not modeled. Busy tier.

Middle Georgia Regional: Macon Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Columbus: Columbus Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Augusta Regional at Bush Field: Augusta Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Athens/Ben Epps: Athens Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Concord-Padgett Regional: Concord Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Fulton County/Charlie Brown Field: Fulton County Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Cobb County International/McCollum Field: Mc Collum Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Gwinnett County/Briscoe Field: Gwinnett Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Hickory Regional: Hickory Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Greenville Downtown: Greenville Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Smith Reynolds: Winston-Salem Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Greenville-Spartanburg International: Greer Approach mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Stanly County: Stanly County Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Chicago O'Hare Intl: eight runways, six of them parallel, and two mega-hubs sharing one field. The most complex board in the game. Heavy tier.

Quad Cities International: Airline connections, leisure jets and GA converge above the Mississippi's Quad Cities. Busy tier.

Dane County Regional Airport-Truax Field: a long 18/36 runway and two crossing strips frame Madison's airline, GA and Truax traffic. Busy tier.

Gerald R. Ford International Airport: a 10,001-foot primary runway, a crossing strip and a shorter parallel shape the Grand Rapids tower board. Busy tier.

Battle Creek Executive at Kellogg Field: Battle Creek Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Southern Wisconsin Regional: Janesville Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Dubuque Regional: Dubuque Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Decatur: Decatur Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Kenosha Regional: Kenosha Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Gary/Chicago International: Gary Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Lewis University: Lewis Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Lawrence J. Timmerman: Timmerman Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Wittman Regional: Oshkosh Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Waukesha County: Waukesha Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Waukegan National: Waukegan Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Denver International: mile-high field, 16,000 ft of runway on the high plains. A busy six-runway hub. Heavy tier.

Seattle-Tacoma Intl: three parallels between Puget Sound and Lake Washington. A busy Alaska stronghold. Busy tier.

Portland International: two Columbia River parallels carry an Alaska-led airline mix, with real Portland arrivals and departures feeding both east and west flows. Busy tier.

Spokane International Airport: a long diagonal and crossing 8/26 runway frame Spokane's Inland Northwest board. Busy tier.

Salt Lake City International: Delta's mountain hub with two long air-carrier parallels and a mixed-use eastern strip. Heavy tier.

Boise Air Terminal/Gowen Field: two long 10/28 parallels and Big Sky Approach anchor a busy Idaho gateway. Busy tier.

Harry Reid Intl: two pairs of parallels crossing on the valley floor. A Southwest stronghold that lands and departs across itself. Heavy tier.

Los Angeles International: four parallel runways in two complexes, with Pacific arrivals and dense domestic and international traffic. Heavy tier.

Ontario International: two long east-west parallels at an Inland Empire passenger and cargo gateway. Busy tier.

San Diego International: one coastal runway, a preferred west flow and airline banks that must share the same pavement. Heavy tier.

Dallas Fort Worth International: seven runways and a dense American Airlines hub, with separate north and south flow banks. Heavy tier.

Lubbock Preston Smith International: Class C radar sequences three runways, including a short GA-only parallel beside the long north-south airline strip. Busy tier.

Midland International Air and Space Port: Permian Basin airline and business traffic meet four runway strips, with two shorter GA runways outside normal flows. Busy tier.

OKC Will Rogers International Airport: two long 17/35 parallels, crossing 13/31 and a short GA strip shape a varied Oklahoma City board. Busy tier.

Waco Regional: Two crossing runways bring regional jets and Central Texas GA into the same sequence. Steady tier.

Abilene Regional: Staggered parallel runways bring regional connections and Big Country GA into a Class C seat. Steady tier.

San Angelo Regional / Mathis Field: Three intersecting runways mix regional jets with Concho Valley training and GA. Steady tier.

Killeen Regional / Robert Gray Army Airfield: A long shared Army runway brings Killeen regional service and Central Texas GA into the same sequence. Steady tier.

Texarkana Regional / Webb Field: Two intersecting runways mix American regional service with Ark-La-Tex training and GA. Steady tier.

East Texas Regional: Two intersecting runways mix East Texas regional jets with training and GA beneath Longview Approach. Steady tier.

Tyler Pounds Regional: Three intersecting runways bring Tyler regional service and East Texas GA into a contract tower seat. Steady tier.

Denton Enterprise: Two staggered parallel runways mix North Texas training and business traffic at Denton Tower. Steady tier.

McKinney National: A single long runway brings North Dallas business aviation and GA into the same tower sequence. Steady tier.

Mesquite Metro: One runway mixes east Dallas training, GA and business traffic at Mesquite Tower. Steady tier.

Dallas Love Field: Two parallel runways mix Southwest jets with Dallas business traffic at Love Tower. Busy tier.

Addison: A single runway brings training and North Dallas business aviation together at Addison Tower. Steady tier.

Fort Worth Meacham International: Meacham Tower mixes business arrivals with Fort Worth training traffic beside a shorter parallel runway. Steady tier.

Perot Field / Fort Worth Alliance: Close parallel runways mix cargo jets and business aviation at Alliance Tower. Steady tier.

Arlington Municipal: One runway mixes Arlington training, GA and business traffic under a contract tower. Steady tier.

Monroe Regional: Monroe Approach works American and Delta arrivals over crossing runways near Bayou D'Arbonne Lake. Steady tier.

Shreveport Regional: Shreveport Tower mixes regional connections, Allegiant jets and GA across crossing runways south of Cross Lake. Steady tier.

Shreveport Downtown: Downtown Tower works GA and business aircraft across crossing runways east of Cross Lake. Steady tier.

John F Kennedy International: four long runways in crossing pairs, with dense domestic feed and a global international arrival bank. Heavy tier.

Newark Liberty International: United's New York-area hub works parallel arrivals and departures beside a crossing strip. Heavy tier.

Philadelphia International: two long east-west parallels and crosswind pavement, with American's transatlantic gateway feeding the Northeast corridor. Heavy tier.

Williamsport Regional: Williamsport Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Lancaster: Lancaster Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Trenton Mercer: Trenton Tower mixes GA and business aircraft across surveyed runways. Steady tier.

State College Regional: University Park Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Capital City: Capital City Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Essex County: Caldwell Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Bridgeport/Sikorsky: Bridgeport Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Danbury Municipal: Danbury Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Tweed-New Haven: New Haven Tower mixes sourced airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Ithaca Tompkins International: Ithaca Tower mixes sourced airline connections, GA and business aircraft across one surveyed runway. Steady tier.

East Hampton Town: East Hampton Tower mixes GA and business aircraft across surveyed runways. Steady tier.

New York Stewart International: Stewart Tower mixes sourced airline connections, GA and business aircraft across surveyed runways. Steady tier.

Wilkes-Barre/Scranton International: Wilkes-Barre Approach sequences regional jets and GA across a Class D field inside the TRSA. Steady tier.

General Edward Lawrence Logan International: six crossing runways on the harbor, with JetBlue and Delta traffic feeding the northeast corridor and transatlantic flights. Heavy tier.

Rhode Island TF Green International: Rhode Island's Class C gateway with a long 5/23 primary and a crossing secondary runway. Busy tier.

Syracuse Hancock International: Central New York Class C with a long 10/28 and crossing 15/33. Busy tier.

Albany International: Capital Region connections and leisure jets share two crossing runways. Busy tier.

Boire Field: Nashua Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Westfield-Barnes Regional: Westfield Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Beverly Regional: Beverly Tower mixes GA and business aircraft across surveyed runways. Steady tier.

New Bedford Regional: New Bedford Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Groton-New London: Groton Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Cape Cod Gateway: Hyannis Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Lebanon Municipal: Lebanon Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Lawrence Municipal: Lawrence Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Martha's Vineyard: Vineyard Tower mixes GA and business aircraft across surveyed runways. Steady tier.

Worcester Regional: Worcester Tower mixes sourced airline connections, GA and business aircraft across surveyed runways. Steady tier.

Griffiss International: Griffiss Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Bradley International: Bradley Approach works two crossing runways beneath Connecticut Class C shelves. Busy tier.

Albuquerque International Sunport: a high-desert Class C junction with long east-west pavement and a crossing northeast-southwest runway. Busy tier.

Phoenix Sky Harbor International: three east-west parallels, with American and Southwest banks crossing a Class B desert gateway. Heavy tier.

Rick Husband Amarillo International: the Texas Panhandle's Class C gateway pairs a 13,502-foot precision runway with crossing pavement and regional airline traffic. Busy tier.

Tucson International Airport: the long 12/30 primary and crossing 4/22 frame a desert approach board. Busy tier.

El Paso International Airport: three runways and a border-city Class C put crossing flows on the scope. Busy tier.

Baltimore/Washington International Thurgood Marshall: Southwest's Mid-Atlantic bank meets three intersecting runways, with 15L/33R reserved for emergency or mercy traffic. Heavy tier.

Washington Dulles International: Dulles: three long north-south parallels carry United's domestic and transatlantic banks through Potomac airspace. Heavy tier.

Richmond International: Potomac Class C arrivals to the long 16/34, with a crossing 2/20 and three published STARs. Busy tier.

Raleigh-Durham International: long primary runway, shorter parallel and a small crosswind strip under Raleigh Approach. Busy tier.

Newport News/Williamsburg International: GA and American regional connections share the Virginia Peninsula's crossing pavement. Steady tier.

Wilmington International: Wilmington Approach mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Charlottesville-Albemarle: Charlottesville Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Coastal Carolina Regional: New Bern Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Hagerstown Regional/Richard A. Henson Field: Hagerstown Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Kinston Regional Jetport at Stallings Field: Kinston Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Greenbrier Valley: Lewisburg Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Lynchburg Regional/Preston Glenn Field: Lynchburg Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.

Martin State: Martin Tower mixes GA and business aircraft across one surveyed runway. Steady tier.

Albert J. Ellis: Ellis Tower mixes airline connections, GA and business aircraft across one surveyed runway. Steady tier.

Salisbury-Ocean City Wicomico Regional: Salisbury Tower mixes airline connections, GA and business aircraft across surveyed runways. Steady tier.