Southwest Airlines
- IATA
- WN
- Fleet
- 800
United Airlines
- IATA
- UA
- ICAO
- UAL
- Alliance
- Star Alliance
- Founded
- 1926
- Fleet
- 1.1K
- Destinations
- 360
United Airlines is one of the three US legacy carriers and operates the world’s largest mainline fleet, flying from hubs including Chicago O’Hare, Denver, Houston, Newark, San Francisco, and Washington Dulles. A founding member of Star Alliance, United marked its centenary in 2026.