what are the major hubs for united airlines
Chicago -- O'Hare
Houston -- Intercontinental
Newark
-1
Section::::Cabin.:United premium transcontinental service.

United Airlines
32307
Denver
-1
Section::::Corporate affairs.:Other facilities.

United Airlines
32307
San Francisco
-1
Section::::Cabin.:United premium transcontinental service.

United Airlines
32307
Washington -- Dulles
Los Angeles
-1
Section::::Cabin.:United premium transcontinental service.

United Airlines
32307