United States

• IATA WNSouthwest AirlinesSouthwest AirlinesUnited States · Fleet 803United States · North AmericaHubs DEN · LAS · MDW +3 · founded 1971Fleet 803 (803 aircraft · Airline report · as of 30 September 2026)Routes 1,351→
• IATA B6JetBlueJetBlueUnited States · Fleet 296United States · North AmericaHubs JFK · BOS · FLL +3 · founded 2000Fleet 296 (296 aircraft · Airline report · as of 30 June 2026)Routes 612→
• IATA F9Frontier AirlinesFrontier AirlinesUnited States · Fleet 165United States · North AmericaHubs DEN · MCO · LAS +3 · founded 1994Fleet 165 (165 aircraft · Airline report · as of 30 June 2026)Routes 496→
• IATA G4Allegiant AirAllegiant AirUnited States · Fleet 124United States · North AmericaHubs LAS · AZA · SFB +3 · founded 1998Fleet 124 (124 aircraft · Airline report · as of 30 June 2026)Routes 842→
• IATA MXBreeze AirwaysBreeze AirwaysUnited States · Fleet 64United States · North AmericaHubs CHS · TPA · PVD +3 · founded 2021Fleet 64 (64 aircraft · Press report · as of 31 August 2026)→
• IATA SYSun Country AirlinesSun Country AirlinesUnited States · Fleet 47United States · North AmericaHub MSP · founded 1983Fleet 47 (47 aircraft · Airline report · as of 30 June 2026)Routes 291→
• IATA XPAvelo AirlinesAvelo AirlinesUnited States · Fleet 17United States · North AmericaHubs USA · HVN · LAL +1 · founded 2021Fleet 17 (17 aircraft · Airline report · as of 15 October 2026)→
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Fleet: each airline’s latest published figure (“group” covers its group carriers); every profile names the source and the date it describes. Routes: airport pairs AviationStack lists for the airline, as of 25 October 2026; not a timetable.