Around 6,000 people who flew with Thomas Cook from Belfast International Airport have been left stranded as a result of the company's collapse.
It is estimated that around 10% are from the Republic of Ireland. All will be repatriated on flights in the next 14 days.
The first flight, from Turkey, landed at Aldergrove this evening.
Two flights from Belfast to Turkey due to operate today were cancelled.
Belfast International Airport Managing Director Graham Keddie said that around 6,000 people due to fly with Thomas Cook over the next two weeks have also had their outward flights cancelled.
He said there would be two repatriation flights each day for the next 14 days to bring home passengers left stranded as a result of the collapse.
Thomas Cook has operated out of Aldergrove for 30 years and employs 60 staff at the airport.
It operates 14 flights each week to eight routes in Turkey, Spain and Cyprus.
This accounts for just under 2% of the airport's annual business, flying around 100,000 passengers from Belfast.