What airlines go in and out of Atlanta airport?

Delta Air Lines and Northwest Airlines*

Delta Connection (Operated by Shuttle America, Chautauqua, Skywest, Pinnacle, ASA, and Comair)

Northwest Airlink (Operated by Mesaba)

AirTran Airways

American Airlines

American Connection (Operated by Chautauqua and Trans States Airlines)

American Eagle

United Airlines

United Express (Operated by Shuttle America and Mesa)

Air Canada Jazz

Continental Airlines

Continental Express (Operated by Express Jet)

Frontier Airlines

Midwest Airlines

Midwest Connect (Operated by Republic)

Spirit Airlines

US Airways

US Airways Express (Operated by Air Wisconsin, PSA, Mesa, and Republic)

AéroMexico

Air Jamaica

Air France

British Airways

KLM

Korean Air

Lufthansa

Omni Air

*Delta and Northwest have recently merged; Northwest is now a wholly-owned subsidiary of Delta Air Lines

Bold Airlines indicate airlines with hubs at Atlanta Hartsfield-Jackson International Airport.