American Airlines flight to Chicago returned to London.
American Airlines flight #AA99 to Chicago turned around over Ireland and returned to London.
The Boeing 787-9 departed London Heathrow at 9:27 BST (scheduled 9.15 on terminal 3).
The aircraft (reg. N836AA) was 40 minutes into flight when the crew requested to turn around.
It landed 1h50 after departure back in London.
The flight is cancelled for the day due to a technical issue.
