Trans World Airlines (TWA), the former second largest United States commercial airline and the main US competitor of Pan Am from 1946 until deregulation in the late 1970s
Northwest Airlines, Inc. (often abbreviated NWA), the major United States airline headquartered in Eagan, Minnesota, near Minneapolis-St. Paul International Airport
American Airlines, Inc. (AA), the world's largest airline in passenger miles transported and operating revenues
Delta Air Lines, Inc., operating as Delta Air Lines and commonly misspelled as "Delta Airlines", the U.S. airline headquartered in Atlanta, Georgia, in the United States
MileagePlus, the frequent flyer program of United Airlines
Delta Connection (the name under which a number of individually owned regional airlines and three wholly owned regional carriers operate short and medium haul routes in association with Delta Air Lines Inc. )
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