Low-cost airline Primera Air has gone into administration.
Thousands of passengers have been stranded abroad, with the airline flying between the UK and Europe, the USA and Canada.
All flights, primarily from Stansted Airport, have been stopped with immediate effect from today (2 October).
What should passengers do if they have flights booked with the Nordic airline?
Passengers are advised not to travel to Stansted or Birmingham Airport when the airline is based.
They should contact the airline as well as their insurance provider.
If they booked through a travel agent then they will be most likely be covered by ATOL protection which covers airlines which go into administration.
However, those who booked their flights through the website will not be covered by this and will have to claim through their travel insurance.
If booked with a credit card, then some protection is offered through the Consumer Credit Act.
Passengers who are stranded abroad without ATOL protection will need to find their own flights back to the UK at their own expense.
They may be able to claim these at a later date thanks to repatriation fares, which the government offers and can be claimed by the phone for a few hours, according to Which?.
In a statement on their website Primera Air said: “Airline Primera Air and IATA codes PF and 6F have been suspended as of today, October 2nd, 2018.”
“On this sad day we are saying goodbye to all of you.
“Kindly understand that the usual options for contacts (via email or phone) can not be offered any longer.”
Reasons for the airline going into administration were blamed on a delay in Airbus aircraft deliveries as well as competing with other low-cost airlines such as Norwegian Air and Wizz Air.
Many confused passengers took to Twitter as the news broke.
One asked: “I bought tickets to fly for this Friday and now I cannot fly. Will I get a refund? I paid £400 for my ticket which is now lost!”
A passenger told the BBC they were “stranded in Malaga” and forced to find their own flights home.
Others confirmed they had some protection: “My credit card company has issued me a refund! Just called them and they put in the dispute against them but I get the refund.”
Monarch Airlines suffered the same fate last year after going bust, leaving more than 100,000 passengers stranded abroad