Passengers travelling from Greece to Northern Ireland were left stranded for over 48 hours due to flight cancellations.
A source said those due to fly were given “substandard rooms” in hotels with “ants in suitcases” and “smelly musty rooms”.
A TUI flight from Kos to Belfast was due to depart on Saturday at 9.20pm, but was cancelled due to “technical difficulties”.
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Passengers were escorted by local police back through the airport, after having gone through security and queuing at the gate, to collect their luggage. “Over 200 passengers” were then taken to a hotel 45 minutes away to stay, Belfast Live reports.
Representatives from TUI then told passengers that the replacement flight had also been cancelled, leaving passengers waiting for over 48 hours to get home.
One passenger from Co Fermanagh told Belfast Live that people are "arguing and angry" at the hotel and families have been left worrying that they don't have enough formula for their babies.
He said: "The airport was tiny and the amount of people was madness. It was rammed and queuing for fast food restaurant was an hour and a half.
"Just want to get home - lots of people complaining."
He continued: "This hotel is now full of passengers going to Belfast and I’ve heard people complaining saying they were meant to be working today but have had to ring work and cancel to say they’re still stuck in Kos.
"I know for me personally it’s quite annoying because you are talking nearly nine hours of travelling from the hotel in Kos to my house in Fermanagh.
"To be fair to TUI, they’ve set us up in this hotel with all-inclusive so there are mixed emotions between people. Some are happy with their free bar but some are angry with not getting home."
Another group from Northern Ireland said that the delay and uncertainty of the situation "majorly impacted" them.
They added: "There are several young children here, people are missing work and have been placed into a hotel with substandard rooms, ants in the suitcases, smelly musty rooms.
"Many people have had to contact their employers, unable to give an update of when they will return to work."
They said that they were informed just after 6pm in Greece, they were told there would be no flight this evening with many people unhappy with the quality of the hotel as they said rooms were “very poor".
A TUI spokesperson said: "We’d like to apologise to customers due to travel on flight TOM1649 from Kos to Belfast which was unable to depart as planned due to operational issues.
"Everyone has been able to stay in their hotels and meals have been provided. We are in touch and will update them with revised travel plans as soon as we can.
"We understand that delays are frustrating and we thank all impacted customers for their patience. Customers on this flight are entitled to compensation in line with regulations and have already been sent information on how to submit a claim."
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