Euro MPs will vote today on planned new rules on pilot hours despite rejection of the rules by the EU transport committee last week.
The British Airline Pilots Association claims the new EU rules would cut UK flight safety.
Pilots were in Strasbourg yesterday to lobby MEPs to send the Commission back to the drawing board and reject the new rules.
The union’s general secretary Jim McAuslan said: “British pilots want to make every flight a safe flight and are deeply concerned that these unsafe new EU rules will put passenger’s lives at risk.
“They are shocked that the UK government and flight safety regulator are helping the European Commission force through unsafe new rules that will mean Britain no longer has the safest skies in Europe.”
He added: “Severe tiredness is already a major safety issues for pilots. The rules governing flying time and rest should be based on the scientific and medical evidence that the EU have ignored in favour of lobbying from airlines.”