Romanian flag-carrier Tarom is looking into the reason why a pilot was unable to operate a service between London Heathrow and Bucharest, forcing cancellation of the flight.
The airline says the crew member was found to have a "medical incapacity", says the airline, which was "discovered" by airport authorities in London during a routine procedure - apparently a test for alcohol consumption.
Tarom is investigating the situation which forced the cancellation of flight RO394 on 6 February, a service typically operated with Airbus A318s.
It says the pilot was suspended upon return until the inquiry is complete. "If the investigation established that the pilot was found positive, upon performance of the alcohol test, he will be immediately fired," it adds.
Tarom says its operational safety is its "main priority" and disciplinary breaches are "not tolerated".