Southwest Airlines said it has returned the Sunday-only take-off and landing slot at Washington Reagan National Airport back to the Federal Aviation Administration.
The Dallas-based carrier had acquired 27 daily slots and the Sunday pair that were part of the 52 slots that American Airlines was required to divest as part of its merger with US Airways.
"We operate some Saturday only flights, but not Sunday only in most cases," said Southwest spokeswoman Whitney Eichinger. "For our schedule, the other slots were much more appealing."
JetBlue Airways received 20 pairs and Virgin America received four pairs. The U.S. Department of Justice must first approve the sale and terms of the deals were not disclosed.