Ryanair have admitted they will be cancelling up to 50 flights a day until the end of October – after “messing up” pilots’ holiday rotas.
It’s feared up to 2000 flights and 350,000 passengers could be affected.
Ryanair’s marketing officer Kenny Jacobs said: “We have messed up in the planning of pilot holidays and we’re working hard to fix that.”
Most of the cancellations are due to a backlog of staff leave, which has seen large numbers of the airline’s staff book holidays towards the end of the year.
Customers do have rights under the European Passenger Rights legislation.
Travel expert Simon Calder insists passengers should be able to claim compensation for the cancellations.
He said: “The rules say if the airline doesn’t have a suitable alternative flight, you have to be booked on a rival airline.”