Up to 10,000 people have attended a rally in Limerick to protest at the Aer Lingus' decision to withdrawn its Shannon to Heathrow route.
It will now operate flights between Heathrow and Belfast International
The protesters want the Irish government to use its shareholding in the company to get the airline to reverse its decision.
Meanwhile, pilots have backed a deal which should clear the way for the opening of the airline's new hub.
Some 80% of votes counted are in favour of the deal with management negotiated at the Labour Relations Commission.
It was agreed the airline could establish new bases, such as Belfast, on local terms and conditions.
Union
Aer Lingus is also to recognise the union representing pilots at the airplane's planned NI base.
Earlier this month, several pilots were suspended after refusing to train new recruits in an ongoing dispute over pay and conditions for Belfast-based employees.
It has been established that people based there will receive less pay and fewer benefits than colleagues in the Republic.
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