Delta's domestic deal competes with sales from AirTran and American, so you should compare fares before you book. Atlanta, Las Vegas, and Orlando are included.
Lufthansa's new deal is one of the first summer Europe sales so far this year. Destinations include Barcelona, Brussels, London, and Lyon.
AirTran's deal includes competitive prices for travel to Atlanta, Chicago, Orlando, and Pensacola. Travel is valid through early June.
The discount is valid on round-trip flights from late April through mid-November, and must be booked online by 11:59 p.m. ET on April 25.
