American Airlines is to add a second daily flight from Heathrow to Philadelphia from next spring.
The carrier announced the plan to double capacity on the route from March 29, 2015, after it was revealed that US rival Delta planned to begin services between Heathrow and Philadelphia from April 7, 2015.
The outbound flight from Philadelphia leaves at 09.55 and arrives at Heathrow at 22.10, while the return service departs Heathrow at 08.20 to arrive at Philadelphia at 11.35.
American’s new flight will operate as part of the transatlantic joint business with British Airways.