Delta Air Lines will launch a new cross-country route from Washington’s Reagan National Airport (DCA), where flight schedules are capacity controlled and restricted by distance.

Delta will begin flying from DCA to Los Angeles on April 24, offering one daily round-trip flight on Boeing 757-200 aircraft that include lie-flat seats in first class.

Swanky lie-flat seats have become one of the latest competition flashpoints among airlines on high-profile cross-country routes. However, Washington had not yet become a player in the domestic lie-flat market, with airlines focusing mostly on flights from New York to Los Angeles and San Francisco for sleeper seats. American, Delta, United and JetBlue all offer lie-flat options on those routes.

Several other cities have recently gotten in on the domestic lie-flat wars. JetBlue, which just