BREAKING American Airlines #AA57 to Miami is now declaring an emergency and returning to London

American Airlines flight AA57 to Miami did a U-turn over France at 10:50 LT. The emergency was declared at 11:00 LT and the Boeing 777-300ER returned to London Heathrow due to maintenance issue.

UPDATE: American Airlines AA57 landed in London Heathrow at 11:37 LT, pilot asked for normal landing and requested the emergency be cancelled after they had touched down.
UPDATE: ETD to Miami now 1pm from London Heathrow.