One of the big three US airlines along with American and Delta
Strongest international US Carrier (especially to Asia)
Member of Star Alliance
Chicago O’Hare (ORD)
Denver (DEN)
Guam (GUM)
Houston George Bush Intercontinental (IAH)
Los Angeles (LAX)
New York Newark (EWR)
San Francisco (SFO)
Washington DC - Dulles (IAD)
United doesn’t own other airlines but contracts with many regional (small plane) carriers that operate as “United Express.” These flights are generally indistinguishable from normal United Flights.