Atlantic Coast Airlines
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| Founded | December 15, 1989 | ||||||
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| Ceased operations | August 4, 2004 | ||||||
| Hubs | Washington Dulles International Airport | ||||||
| Focus cities | Chicago O'Hare International Airport | ||||||
| Frequent-flyer program | |||||||
| Alliance | |||||||
| Fleet size | 121 | ||||||
| Destinations | 37 | ||||||
| Parent company | Atlantic Coast Holdings, Inc. | ||||||
| Headquarters | Dulles, Virginia, U.S. | ||||||
| Key people | Kerry Skeen (CEO) | ||||||
| Website | atlanticcoast.com | ||||||
Atlantic Coast Airlines (ACA) was an airline based in the United States owned by Atlantic Coast Holdings, Inc. It operated as United Express for United Airlines and Delta Connection for Delta Air Lines. It was headquartered in the Dulles area of unincorporated Loudoun County, Virginia, United States. Previously it was headquartered in Reston, unincorporated Fairfax County. Before then, it was headquartered in Sterling, unincorporated Loudoun County.