Atlantic Coast Airlines (ACA) was a regional 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.
History
The airline was established and started operations on December 15, 1989, and had been in a marketing agreement with United Airlines since its inception.