Thousands of British holidaymakers have been hit by the collapse of Brighton-based Turkey specialist, Holidays 4U.
The Civil Aviation Authority confirmed that 50,000 tourists will be affected by the collapse of the company, which also traded as Aegean Flights.
Over 13,000 people were abroad with the operator when it announced it had gone into administration, and the company had taken a further 20,000 bookings, with an average of three passengers for each one.
All future departures to Turkey with the company, including those scheduled for this evening, have been cancelled.
The CAA confirmed that all flights and packages sold by the operator will be protected under its ATOL, but customers who bought flight-only deals will not be refunded for the accommodation they bought separately.
A CAA spokesman told travelmole.com: 'We don't know what proportion of the company's forward bookings were flight only, but it could be a significant number.'
Consumer association Which? is advising customers to ask their accommodation provider to refund their money or allow them to re-book for another date or to check if they are covered by their travel insurance.
And people who have booked packages or charter flights through Holidays 4U should make a claim for a refund through the CAA.
Holidays 4U, which was licensed to carry 100,500 passengers a year, had a bond for £4.5m, and a turnover of £35m a year, blamed its collapse on 'difficulties faced by the travel industry in 2010 and 2011', and 18 members of staff will be affected.
More than 2000 holidays ruined as British firm goes bust