The Tunisian airline apologised to passengers, saying the decision was aimed at "preserving the safety of the fleet" following an "altercation" at Tunis-Carthage International Airport.
Tunisian media reported that a fight had broken out between technicians and a captain and his co-pilot, following tensions between the two professions in recent weeks over uniforms.
Mechanics also reportedly held a recent sit-in in front of a union headquarters to denounce their treatment by pilots.
Police reinforcements were sent to the airport and a crisis cell including the transport minister was set up to resolve the situation.
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