American Airlines is to add a second daily flight between Heathrow and Los Angeles from March 2015.
The US carrier will begin operating the new flight with a three-class B777-300ER, with 60 fully-flat seats in first and business class, on 29 March.
The outbound services will depart Heathrow at 12:15 and 14:00 and arrive at LAX at 15:40 and 17:30 local time respectively. The return services will take-off from Los Angeles at 17:55 and 19:35 and land in London at 12:25 and 14:15 local time the following day.
The additional service will mean that American and BA will operate a total of four daily flights on the Heathrow-LAX route.