Delta Air Lines, Inc. provides scheduled air transportation for passengers and cargo in the United States and internationally. The company operates through two segments, Airline and Refinery. Its domestic network centered on core hubs in Atlanta, Minneapolis-St. Paul, Detroit, and Salt Lake City, as well as coastal hub positions in Boston, Los Angeles, New York-LaGuardia, New York-JFK, and Seattle; and international network centered on hubs and market presence in Amsterdam, Bogota, Lima, Mexico City, London-Heathrow, Paris-Charles de Gaulle, Sao Paulo, Seoul-Incheon, and Tokyo. The company sells its tickets through various distribution channels, including delta.com and the Fly Delta app; acts as a reservations specialists; and operates online travel and traditional brick and mortar agencies. It also provides aircraft maintenance and engineering support, repair, and overhaul services; and vacation packages to third-party consumers. The company operates through a fleet of approximately 1,273 aircrafts. Delta Air Lines, Inc. was founded in 1924 and is based in Atlanta, Georgia.

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.

SkyWest, Inc., through its subsidiaries, engages in the operation of a regional airline in the United States. It operates through two segment, SkyWest Airlines and SWC; and SkyWest Leasing. The company is also involved in leasing regional jet aircraft and spare engines to third parties; and provision of on-demand charter, airport customer, and ground handling services. As of December 31, 2023, its fleet consisted of 603 aircraft; and provided scheduled passenger and air freight services with approximately 1,850 total daily departures to various destinations in the United States, Canada, and Mexico. SkyWest, Inc. was incorporated in 1972 and is headquartered in Saint George, Utah.

Copa Holdings, S.A., through its subsidiaries, provides airline passenger and cargo services. The company offers approximately 375 daily scheduled flights to 82 destinations in 32 countries in North, Central, and South America, as well as the Caribbean from its Panama City hub. As of December 31, 2023, it operated a fleet of 106 aircraft comprising 76 Boeing 737-Next Generation aircraft, 29 Boeing 737 MAX 9 aircraft, and one Boeing 737-800 Boeing Converted Freighter. The company was founded in 1947 and is based in Panama City, Panama.

Controladora Vuela Compañía de Aviación, S.A.B. de C.V., through its subsidiary, Concesionaria Vuela Compañía de Aviación, S.A.P.I. de C.V., provides air transportation services for passengers, cargo, and mail in Mexico and internationally. The company operates approximately 590 daily flights on routes connecting 43 cities in Mexico, 22 cities in the United States, 4 cities in Central America, and 2 cities in South America. As of December 31, 2022, it leased 116 aircrafts and 23 spare engines. The company also offers merchandising, travel agency, and loyalty program, as well as specialized and aeronautical technical services. Controladora Vuela Compañía de Aviación, S.A.B. de C.V. was incorporated in 2005 and is headquartered in Mexico City, Mexico.

Spirit Airlines, Inc. provides airline services. The company also offers hotels and rental cars services. It serves 93 destinations in 15 countries in the United States, Latin America, and the Caribbean. As of December 31, 2023, the company operated a fleet of 205 Airbus single-aisle aircraft. The company was formerly known as Clippert Trucking Company and changed its name to Spirit Airlines, Inc. in 1992. Spirit Airlines, Inc. was incorporated in 1964 and is headquartered in Miramar, Florida.

Mesa Air Group, Inc. operates as the holding company for Mesa Airlines, Inc. that provides regional air carrier scheduled passenger services. The company offers scheduled flight and cargo services. As of September 30, 2023, it operated a fleet of 80 aircraft with approximately 296 daily departures to 86 cities in the United States and Mexico. Mesa Air Group, Inc. was founded in 1982 and is headquartered in Phoenix, Arizona.