Delta Air Lines today launches an upgrade to its service between New York’s John F. Kennedy International Airport and Los Angeles International Airport with the introduction of three Boeing 757-200 aircraft featuring full flat-bed seats in the BusinessElite cabin. These aircraft join Delta’s existing international 767-300ERs serving the New York-Los Angeles route.

All flights between New York-JFK and Los Angeles, San Francisco, and Seattle will feature flat-bed seats on Boeing 757 and 767 aircraft by summer 2015.

“Customers traveling between New York and Los Angeles continue to tell us they expect the best from Delta including the comfort of full flat-bed seats in BusinessElite and an upgraded Economy Comfort experience,” says Jeff Robertson, vice president–Product Development, Sky Clubs, and Marketing Communications, in a release. “Delta is focused on providing the industry’s best travel experience on the most important non-stop route in the United States.”

Earlier this month, Delta announced upgrades to Economy Comfort including complimentary pillows and blankets on all its transcontinental flights between JFK and LAX, SFO, and SEA. Economy Comfort customers also receive a Delta sleep kit, including eyeshades and earplugs, complimentary Luvo snack wraps, a bottle of water, and Luvo frozen yogurt bars (on flights departing prior to 9 pm).