Jet2 flight LS1451 departed London Stansted at 08:05 GMT for a 4-hour flight to Fuerteventura Island.
The Boeing 737-800 (registration G-DRTW) was cruising at 37,000 feet when pilots declared an emergency (squawk 7700).
UDPATE 11:17 CET
Flight LS1451 is diverting to Faro.
UPDATE 11:42 CET
Diverted due to issue with left engine according to source.
UPDATE 15:00 CET
A New departure with a spare aircraft (G-DRTV) is estimated to depart Faro at 16:00.
UPDATE 16:30 CET
The flight departed at 16:26.
