Flight #UA47 from Frankfurt to Houston is declaring an emergency.
The flight departed Frankfurt at 15:20 CEST.
More than one hour into flight, the crew declared an emergency in French Airspace.
The flight was expected to land in Houston at 18:00 CDT.
The Boeing 777-200ER performed a U-turn.
UPDATE #1 We have confirmation the aircraft (reg. N795UA) is suffering a technical issue.
UPDATE #2 The flight is holding 31,000 ft West of Normandy.
UPDATE #3 Flight #UA47 is returning to Frankfurt.
UPDATE #4 United confirms the flight is canceled.