Passengers have been expressing their frustration after Aer Lingus cancelled a number of flights over the weekend.
The airline says a spike in the number of COVID-19 cases among staff, combined with air traffic control strikes and ongoing issues at airports, contributed to the cancellations.
It has apologised to those customers impacted.
"Where cancellations have occurred, Aer Lingus has sought to re-accommodate disrupted passengers on the next available alternative service.
"Aer Lingus wishes to apologise to those customers that have been impacted, and has shared detail regarding customers’ rights the airlines’ obligations under Regulation (EC) 261/2004", the carrier said.
Travel expert Eoghan Corry told Lunchtime Live what people should do if they are affected.
"It's a little bit of every man for himself... the rights that they have are in their favour.
"Under EU 261, airlines have to get you back and compensate and there's no ambiguity about what they have to pay for food, accommodation, things like that.
"In the absence of a communication from an airline, make your own way back and chase it down afterwards is pretty much what I'd advise.
"The reality is airlines are supposed to be in touch with you, they're supposed to e-mail you.
"Short notice is not unusual by the way, that happens a lot - aircraft go tech, or crew go out of hours, that's a big issue with delays.
"And airlines don't have much notice themselves about when flights will be cancelled: the real problem here is the breakdown of communication."
Eoghan says anyone facing problems with refunds from airlines can get more information from flightrights.ie
But he says these problems are likely to continue.
"You can't say for certain that a flight won't be cancelled - but the number of flights that have been cancelled over the weekend was small enough.
"Our big problem is... every single aspect of the industry's under pressure.
"Famously Dublin Airport security queues, the airlines, people servicing the airlines.
"It means that we're likely to see cancellations, we're likely to see delays - especially if the French air traffic controllers ramp up the number of strikes.
"And they are very good at striking".
