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Flybe passengers flying from Cardiff are being warned not to travel to the airport after the airline collapsed.
The airline went into administration on Wednesday, putting 2,000 jobs at risk.
Up to 340,000 passengers a year flew with the airline from Cardiff Airport to destinations in the UK and Europe.
Cardiff Airport said all Flybe flights were cancelled and people should not travel to the airport unless they had booked alternative flights.
The airline was responsible for about 24% of flights from Cardiff Airport and operated routes to Edinburgh, Belfast, Dublin and Cork.
Flights to Anglesey, Teesside, and Aberdeen, will continue to operate as normal with Eastern Airways, which is a franchise of Flybe.
In a letter to the airline's staff, Flybe chief executive Mark Anderson said: "Despite every effort, we now have no alternative - having failed to find a feasible solution to allow us to keep trading.
"I am very sorry that we have not been able to secure the funding needed to continue to deliver our turnaround," he added.
Cardiff Airport's chief executive Deb Bowen Rees said the loss of the airline would have a "large impact" on the business, but Cardiff Airport was in a strong position to deal with the loss.
She said the airport was "actively talking to a number of airlines" about taking over core domestic routes.
The Welsh Government bought the struggling airport in 2013 for £52m and while passenger numbers have increased, in December 2019 the airport posted a pre-tax loss of £18.5m.
"Really we are in a much stronger position to address this now and Flybe have played a very important part in enabling us to get to this position," Ms Bowen Rees told Claire Summers on BBC Radio Wales.
What are your rights as a passenger?
Flybe customers who bought tickets directly from the company will not be protected by the Atol scheme.
However, if you went through a travel agent or other third party you might be covered.
Some people may be able to get their money back if they paid by credit card or with some debit cards.
The Welsh Government said: "We are working closely with the UK government and the management team at Cardiff Airport on the impact of the Flybe news."
Ministers had been considering giving the airport a further £6.8m, after approving a loan of £21.2m last year, to invest in buildings and infrastructure, route development, and security.
Plaid Cymru said the collapse of the airline, which attracted between 320,000 to 340,000 passengers to Cardiff a year, was "deeply concerning" and serious questions needed to be asked about the Welsh Government's handling of the airport's loan.
The Welsh Conservatives urged the Welsh Government to work fast to replace the routes and secure jobs.
Masterchef winner Gary Maclean was due to fly from Glasgow to Cardiff for an event on Thursday, and is now driving nearly 400 miles to get there.
"We woke up to a text saying the flight wasn't happening," he said. "We had to be up at 03:30 GMT, we didn't have any other plans to get there."
"It's just one of those things", he said.
'Loss-making'
Flybe had been hoping for a £100m lifeline and changes to Air Passenger Duty taxes.
The carrier ran into difficulties last year and was bought by a consortium which includes Virgin Atlantic.
In January, the new owners said they would pump £30m into the business to keep it afloat, but appealed to the UK government for additional support.
Simon Calder, travel editor of the Independent, said Cardiff's departure board would be looking "very very thin".
"Because Flybe was losing so much money we can conclude that most of its routes were loss-making," he said.
"Now that doesn't necessarily mean they were all loss-making, and if you look, for instance, at the flights from Cardiff to Edinburgh, you have basically three a day.
"It might be that Ryanair or EasyJet would come in and offer one or two a day.
"But other routes - I genuinely fear that there is not going to be much of an appetite for, for example, putting on a flight to Jersey," he said.
The collapse of Flybe is a huge blow for Cardiff Airport, with about 340,000 of the 1.6m passengers flying from the airport every year using the airline.
That is a huge proportion, but not as much as it used to be.
It is a serious blow not just for the number of passengers, but for those using the shops and other services provided by Cardiff Airport.
We have seen in the past that when airlines have pulled out, Cardiff Airport has found replacements for some busy routes fairly quickly, such as Glasgow, but it is a very difficult time for airlines, and it has not just been Flybe who have been struggling.
Cardiff Airport had been trying to get a loan from the Welsh Government and it had been said that a catastrophic event, like the collapse of an airline, would be taken into account as part of the decision making process.