Southwest Airlines Co. operates as a passenger airline company that provides scheduled air transportation services in the United States and near-international markets. As of December 31, 2023, the company operated a total fleet of 817 Boeing 737 aircraft; and served 121 destinations in 42 states, the District of Columbia, and the Commonwealth of Puerto Rico, as well as ten near-international countries, including Mexico, Jamaica, the Bahamas, Aruba, the Dominican Republic, Costa Rica, Belize, Cuba, the Cayman Islands, and Turks and Caicos. It also provides inflight entertainment and connectivity services on Wi-Fi enabled aircraft; and Rapid Rewards loyalty program that enables program members to earn points for dollars spent on Southwest base fares. In addition, the company offers a suite of digital platforms to support customers' travel needs, including websites and apps; and SWABIZ, an online booking tool. Further, it provides ancillary services, such as Southwest's EarlyBird Check-In, upgraded boarding, and transportation of pets and unaccompanied minors. Southwest Airlines Co. was incorporated in 1967 and is headquartered in Dallas, Texas.

American Airlines Group Inc., through its subsidiaries, operates as a network air carrier. The company provides scheduled air transportation services for passengers and cargo through its hubs in Charlotte, Chicago, Dallas/Fort Worth, Los Angeles, Miami, New York, Philadelphia, Phoenix, and Washington, D.C., as well as through partner gateways in London, Doha, Madrid, Seattle/Tacoma, Sydney, and Tokyo. It operates a mainline fleet of 965 aircraft. The company was formerly known as AMR Corporation and changed its name to American Airlines Group Inc. in December 2013. American Airlines Group Inc. was founded in 1926 and is headquartered in Fort Worth, Texas.

Alaska Air Group, Inc., through its subsidiaries, operates airlines. It operates through three segments: Mainline, Regional, and Horizon. The company offers scheduled air transportation services on Boeing jet aircraft for passengers and cargo in the United States, and in parts of Canada, Mexico, Costa Rica, Belize, Guatemala, and the Bahamas; and for passengers across a shorter distance network within the United States, Canada, and Mexico. Alaska Air Group, Inc. was founded in 1932 and is based in Seattle, Washington.

JetBlue Airways Corporation provides air transportation services. The company operates a fleet of Airbus A321, Airbus A220, Airbus A321neo, Airbus A320 Restyled, Airbus A320, Airbus A321 with Mint, Airbus A321neo with Mint, Airbus A321neoLR with Mint, and Embraer E190 aircraft. It also serves 100 destinations across the United States, the Caribbean and Latin America, Canada, and Europe. In addition, it operates airport lounges. The company was incorporated in 1998 and is based in Long Island City, New York.

Air Transport Services Group, Inc., together with its subsidiaries, provides aircraft leasing, and air cargo transportation and related services in the United States and internationally. It operates in two segments, Cargo Aircraft Management Inc. (CAM) and ACMI Services. The company offers aircraft, flight crews, aircraft hull and liability insurance, and aviation fuel services; and aircraft maintenance and modification services, including airframe modification and heavy maintenance, component repairs, engineering services, and aircraft line maintenance. It also provides equipment maintenance services; cargo load transfer and package sorting services; crew training services; and airline express operation, line and heavy maintenance, and ground handling services. The company's ground support services include labor and management for cargo load transfer and sorting; design, installation, and maintenance of material handling equipment; leasing and maintenance of ground support equipment; general facilities maintenance; and resells aviation fuel at the air park in Wilmington, Ohio. Further, the company operates cargo and passenger transportation business; resells and brokers aircraft parts; and performs passenger-to-freighter and passenger-to-combi conversions of aircraft. It provides its services to delivery companies, freight forwarders, airlines, air transportation, e-commerce, package delivery, and logistics industries, as well as government customers. As of December 31, 2023, the company's in-service aircraft fleet consisted of 107 owned Boeing aircraft, three Airbus aircraft, and 20 leased aircraft. The company was formerly known as ABX Holdings, Inc. and changed its name to Air Transport Services Group, Inc. Air Transport Services Group, Inc. was founded in 1980 and is headquartered in Wilmington, Ohio.

Sun Country Airlines Holdings, Inc., an air carrier company, operates scheduled passenger, air cargo, charter air transportation, and related services in the United States, Latin America, and internationally. It operates through two segments, Passenger and Cargo. The company also provides crew, maintenance, and insurance services through ad hoc, repeat, short-term, and long-term service contracts; and loyalty program rewards. As of December 31, 2023, its fleet consisted of 60 Boeing 737-NG aircraft, which includes 42 passenger fleet, 12 cargo, and 6 leased to unaffiliated airlines aircraft. The company serves leisure, and visiting friends and relatives passengers; charter and cargo customers; military branches; collegiate and professional sports teams; wholesale tour operators; schools; companies; and other individual entities through its website, call center, and travel agents. Sun Country Airlines Holdings, Inc. was founded in 1983 and is headquartered in Minneapolis, Minnesota.

Air T, Inc., through its subsidiaries, provides overnight air cargo, ground equipment sale, and commercial jet engines and parts in the United States and internationally. The company's Overnight Air Cargo segment offers air express delivery services. As of March 31, 2024, this segment had 105 aircraft under the dry-lease agreements with FedEx. Its Ground Equipment Sales segment manufactures, sells, and services aircraft deicers, scissor-type lifts, military and civilian decontamination units, flight-line tow tractors, glycol recovery vehicles, and other specialized equipment. This segment sells its products to passenger and cargo airlines, ground handling companies, the United States Air Force, airports, and industrial customers. The company's Commercial Jet Engines and Parts segment offers commercial aircraft trading, leasing, and parts solutions; commercial aircraft storage, storage maintenance, and aircraft disassembly/part-out services; commercial aircraft parts sales, exchanges, procurement services, consignment programs, and overhaul and repair services; and aircraft instrumentation, avionics, and various electrical accessories for civilian, military transport, regional/commuter and business/commercial jet, and turboprop aircraft to airlines and commercial aircraft leasing companies. This segment also provides composite aircraft structures, and repair and support services, as well as aircraft service and maintenance services. Air T, Inc. was incorporated in 1980 and is based in Charlotte, North Carolina.

Hawaiian Holdings, Inc., through its subsidiary, Hawaiian Airlines, Inc., engages in the scheduled air transportation of passengers and cargo. It provides daily services on North America routes between the State of Hawai'i and Long Beach, Los Angeles, Oakland, Ontario, Sacramento, San Diego, San Francisco, and San Jose, California; Las Vegas, Nevada; Seattle, Washington; Portland, Oregon; Phoenix, Arizona; New York City, New York; Austin, Texas; and Boston, Massachusetts. The company also offers daily service on its Neighbor Island routes among the four major islands of the State of Hawai'i. In addition, it offers scheduled service on its international routes between the State of Hawai'i and Tokyo (Narita and Haneda), Japan, Osaka, Japan; Sydney, Australia; Auckland, New Zealand; Pago Pago, American Samoa; Papeete, Tahiti; and Seoul, South Korea, as well as operates various ad hoc charters. The company distributes its tickets through various distribution channels, including its website hawaiianairlines.com primarily for North America and Neighbor Island routes, as well as through travel agencies and wholesale distributors for its international routes. As of December 31, 2023, its fleet consisted of 19 Boeing 717-200 aircraft for the Neighbor Island routes; 24 Airbus A330-200 aircraft; and 18 Airbus A321neo for the North America and international routes. The company was incorporated in 1929 and is headquartered in Honolulu, Hawaii.