Pilots at Aer Arann, which operates Aer Lingus regional services, have voted in favour of industrial action in a dispute over pay.
In a ballot by the Irish Airline Pilots Association (Ialpa), 91 per cent of pilots voted in favour of strike action.
The pilots are calling for the reversal of a 10 per cent pay cut which was imposed in 2009.
An Ialpa spokesman said the question now was what type of industrial action will take place.
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Aer Arann operates Aer Lingus regional services under a franchise agreement between the two airlines. The airline carried 116,000 passengers last month.