After many years as the USA's largest domestic carrier, United is now also a major world airline serving cities nationwide and throughout the globe, in conjunction with its partners in the world 'Star Alliance' of international airlines. United Mileage Plus awards are accrued on every United flight.
U.S. Airways offers extensive service throughout Eastern U.S. and a more limited service in the West. International destinations include major centers in Europe and the Caribbean.
With world headquarters in Dallas, Texas, American Airlines and its commuter subsidiary American Eagles provide service to North America and throughout the world. American is a member of the One World Alliance.
Setting the standard for inflight and customer service, Continental is one of America's longest established airlines. Serving North America, and the whole world, Continental has alliances with many major world airlines including: Northwest, Alaska, and Virgin Airlines.
Delta serves major visitor destinations worldwide including Europe, Africa, Asia and North America, as well as a very extensive network within the US. With Delta you can earn SkyMiles on every flight. Delta is a member of the world SkyTeam alliance.