Airline Eastern Airways has suspended operations, according to the Civil Aviation Authority (CAA).
The regional airline, which operated flights from six UK airports, has cancelled all its flights, and passengers who had booked with Eastern have been told not to travel to airports.
A CAA statement read: "Eastern Airways, which operated regional services from airports across the United Kingdom, has suspended operations.
"All Eastern Airways operated flights are now cancelled. Therefore, please do not go to the airport as flights will not be operating.
"Eastern Airways customers are therefore urged to make their own alternative travel arrangements via other airlines, rail or coach operators."
Eastern Airways operated scheduled flights from London Gatwick, Humberside, Teesside International, Aberdeen, Wick and Newquay airports.
Selina Chadha, the CAA's consumer and markets director, said: "We urge passengers planning to fly with this airline not to go to the airport as all Eastern Airways flights are cancelled.
"Eastern Airways customers should visit the Civil Aviation Authority's website for the latest information."
Read more from Sky News:
King heckled over Prince Andrew and Jeffrey Epstein
Plan for Southport killer 'removed references to his anger'
The suspension of operations follows Eastern Airways (UK) filing a notice of intention to appoint an administrator at the Insolvency and Companies Court, which is within the High Court, on Monday morning.
Eastern Airways, which was founded in 1997, also operated charter flights for sports teams, including Premier League and Championship clubs.
Free travel for Eastern Airways passengers
Passengers booked on Eastern Airways flights, along with the airline's staff, have been offered free travel on 28 and 29 October by a number of train companies.
The CAA added: "Following the suspension of Eastern Airways operations, London and North Eastern Railway, ScotRail, TransPennine Express, and Northern Railway will offer free standard class travel to Eastern Airways staff and customers on Tuesday 28 and Wednesday 29 October, on suitable routes operated by each train company.
"To access this support, affected individuals should present either an Eastern Airways employee ID, boarding pass, or flight confirmation to station staff."
Eastern Airways has been approached for comment.
(c) Sky News 2025: UK regional airline Eastern Airways 'suspends operations'

David Lammy blames 'human error' for release of migrant sex offender - as confirms independent investigation
King heckled over Prince Andrew and Jeffrey Epstein during visit
Alleged Madeleine McCann family stalker had 'genuine belief' she was missing girl
Romanian grooming gang jailed for raping and sexually exploiting women