Tour operator Sunworld has confirmed it has made alternative arrangements for its customers who were due to travel on XL Airways flights over the weekend.
One return XL flight from Dublin to Lanzarote tomorrow, and a further two return XL flights from Dublin and Cork to Faro on Sunday have been replaced.
However, passengers who were originally to travel on the Cork flight will now be bussed to Dublin and passengers have been advised that the times of all the flights will be different to those originally timetabled.
Travel agents have been informed of the changes and will let affected passengers know.
4,000 Irish holidaymakers hit by XL collapse
Up to 4,000 Irish holidaymakers were affected by the collapse of the British tour operator XL Leisure Group.
The group, which operates in Ireland as XL Holidays, went into administration overnight leaving 85,000 holidaymakers stranded abroad.
It declared bankruptcy having failed to secure a rescue package amid deep financial difficulties.
Speaking on Morning Ireland, Commissioner for Aviation Regulation Cathal Guiomard said many Irish people were affected.
He advised passengers that were due to fly home today to seek alternative transport, and that they would then be able to recover the cost of the flights with reference to a claim form on the CAR website.
As for passengers due to return home from tomorrow, Mr Guiomard said that the regulator was seeking to obtain alternative aircraft to bring those people home.
However, those people who booked directly with the tour operator and paid for holidays but have yet to start their journey will be unable to travel. They are also advised to make a claim to the commission.
Irish passengers can consult the regulator's website here.
The commission now says it has organised flights back from Reus in Spain for XL customers who had been due to fly back this morning, but they will not be able to fly back until Sunday.
Company blames oil prices, credit crunch
They will also be able to claim back reasonable expenses incurred by the extended stay.
The regulator is still working to try to organise a flight back for those stranded in Skiathos in Greece, who were due to fly home later today.
It hopes that if it secures an aircraft to do this trip, it will be able to hang onto the aircraft for a number of days to bring home all the other Irish XL customers stranded abroad, as their flights arise.
XL Airways provides flights to more than 50 destinations across Europe, America and Africa.
It operates flights from Dublin to Reus and Skiathos. Four flights were scheduled on those routes today.
In a statement on its website, the group said it had been hit by rising fuel costs and the credit crunch.
It said all its flights have been cancelled and its fleet of aircraft are now grounded. Passengers yet to travel should make alternative arrangements.
The Civil Aviation Authority in Britain said it was working with the travel industry to bring stranded holidaymakers home.
It estimated there are 50,000 customers abroad who had booked through an XL tour operator, 10,000 on holiday with XL Airways, and 25,000 with other tour operators who shared the XL flights.
A further 200,000 customers have advance bookings with the XL tour operators, it said.
Passengers with advance bookings have been advised not to go to their departure airport.
Last month, two companies, a tour operator based in Co Mayo and a low budget airline collapsed leaving hundreds of passengers stranded.
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