Atlantic Southeast Airlines (ASA) was a regional airline in the United States based in the A-Tech Center in College Park, Georgia, flying to 144 destinations as a Delta Connection carrier on behalf of Delta Air Lines via a code sharing agreement and, as of February 2010, commenced service as a United Express carrier on behalf of United Airlines via a separate code sharing agreement.

June 27 saw the start of operations with three 19-passenger de Havilland Canada DHC-6 Twin Otter turboprop aircraft on an intrastate route between Atlanta and Columbus.

On March 15, 2006, ASA was allowed to change its call sign back to ACEY, after the New Mexico fighter unit was disestablished.

[2][3] Over the years, ASA's ICAO identifier changed from ASE to CAA to ACY to ASQ..[citation needed] The company went public when the initial stock offering was completed in 1982.

The first of a fleet of Embraer EMB-110 Bandeirante twin engine turboprop commuter airliners was delivered to ASA in December 1980.

[citation needed] ASA initiated jet service with introduction of British Aerospace BAe 146-200 aircraft in 1995.

Delta Air Lines acquired the company on March 22, 1999, increasing its stake in Atlantic Southeast Airlines from 28% to 100%, and operations began on May 11 of that year.

In 2000, Comair, a Delta Connection partner, joined ASA in announcing industry's largest regional jet order.

[citation needed] On June 1, 2006, ASA filed with the US Department of Transportation for an exemption to begin service from Los Angeles International Airport to nine Mexican destinations under the Delta Connection brand.

ASA also announced the opening of a Los Angeles crew base on December 1, 2006, to support the expanded west coast operations.

On December 20, 2006, Skywest Inc. announced that 8 Comair CRJ700 aircraft would be transferred to Atlantic Southeast Airlines and operated out of Delta's Cincinnati hub beginning in January 2007.

As part of the fleet enhancement, 20 CRJ200 aircraft were removed from ASA's Delta Connection Agreement beginning in June 2010.

[citation needed] On May 21, 2010, Atlantic Southeast unveiled a new brand (top of page on right), moving away from "ASA," and a new vision.

Brand information and press releases pertaining to "SureJet" were removed from Atlantic Southeast's public and employee websites and the company's combined identity was reconsidered.

The airline operated the following aircraft types at various times during its existence:[citation needed] Before the merger, it headquartered in the A-Tech Center in College Park, Georgia,[14][15] The City of Atlanta owns the facility, which now houses the Atlanta Police Department Helicopter Unit.

The Atlanta City Council and Mayor of Atlanta Shirley Franklin approved of the new 25-year ASA lease, which also gave the airline new hangar space to work on 15 to 25 aircraft in overnight maintenance; previously its aircraft were serviced at Concourse C. The airport property division stated that the hangar was built in the 1960s and renovated in the 1970s.