American Airlines' new B777-300ER aircraft will debut on the Dallas Fort Worth-London route from the end of January 2013, before launching on the New York-London service from February.
The carrier announced details of its new fully-flat seating on board the B777-300ER earlier this year, featuring aisle access for all passengers and a 15.4-inch TV screen.
AA will take delivery of the first of 10 B777-300ERs later this year, before launching the aircraft on its Dallas Fort Worth-Sao Paulo route from December 13.
The carrier will roster the Boeing aircraft on to its Dallas Fort Worth-London Heathrow route on January 31, 2013, followed by New York-London from February 14.
Bookings for London-Dallas flights on the B777-300ER will open on May 27. AA is adding a fourth daily service between London and Dallas on June 14.
The carrier is also set to relocate its check-in area to zones F and G at Heathrow’s Terminal 3 from May 31, although premium passengers will continue to be able to use the existing flagship check-in in front of the terminal.