Transatlantic budget carrier Zoom Airlines has suspended all flights and is applying to go into administration.
Thousands of passengers due to fly with Zoom have been told to rebook with other carriers, and to contact credit or debit card issuers about refunds.
Earlier, two of the airline's jets were held at Glasgow and Cardiff airports.
UK-Canadian Zoom blamed its problems on the "horrendous" price of jet fuel - which had added $50m (£27.3m) to annual fuel bills - and the economic slowdown.