Atlantic Southeast Airlines

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; in February 2010, it also commenced service as a United Express carrier on behalf of United Airlines via a separate code sharing agreement. It was a wholly owned subsidiary of SkyWest, Inc.

Source: Wikipedia — Atlantic Southeast Airlines (CC BY-SA 4.0)