The operator of Dublin Airport is to publish its plan to tackle long delays for passengers today.
The Dublin Airport Authority will appear before the Oireachtas Transport Committee to outline how queues, similar to last weekend, will be avoided.
More than 1,400 people missed flights after staffing issues at security resulted in long lines forming outside terminals.
Yesterday, the operator admitted to ministers it can't guarantee what happened at the weekend won't be repeated again.
SIPTU, Ireland's largest trade union, says poor pay and conditions for workers is a key factor in the airport fiasco.
Independent Senator and Transport Committee member Gerard Craughwell says the situations is a mess.
"Telling us at this stage that they cannot guarantee that next weekend is not going to be a disaster, that's just unbelievable at this stage," Craughwell said.
"We're coming into the biggest bank holiday of the year and we cannot be sure that we'll get people through the airport on time.
"Already we've 1,000 people, I understand, who will be making a claim against the DAA for loss for flights, loss of hotel accommodation, and loss of theatre tickets - god knows what else."
Dublin Airport Authority has apologised to all passengers affected and admitted their performance “hasn’t been good enough and we’re looking at what’s gone wrong. We’re looking to rectify that for the days ahead.
“So hopefully we can get back to the way things have been for the last few months - since we last saw this at the end of March we’ve made significant progress."