RYANAIR passengers who've been refused a refund might be able to get their money back if they claim from their credit card provider or bank.
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And with the UK government warning against all but essential travel worldwide, it's seen millions of flights cancelled.
But Ryanair has angered passengers by refusing cash refunds and offering vouchers instead.
Those who refuse vouchers will be placed in a "cash refund queue" until the pandemic has passed.
More than 13.5million passengers flew with Ryanair last April, but the airline says that as its payment agents are required to stay at home, they can't currently process cash refunds.
Consumer group Which? says British Airways and TUI are also breaking the law by refusing to offer cash refunds.
But if you desperately need the money, there are alternative ways to claim - here's what you need to know.
Claim to your credit card provider for purchases over £100
For purchases of between £100 and £30,000 made on credit card, your card provider is jointly liable if you don't get the service you paid for.
This is under a law called Section 75 of the Consumer Credit Act.
In this scenario, you could claim a full refund from your credit card provider for cancelled flights.
If your flights are yet to be cancelled, you'll likely need to wait until they are in order to claim, as from your card provider's perspective this service is still going ahead.
If you think you have a claim, contact your card provider directly - Which? has a free tool that can help you do this.
You should make a claim within six years of buying the goods or services
Just bear in mind you'll need to claim for different transactions separately, for example if you paid for your flights and hotels separately.
One grey area to watch out for is goods paid through an agent, such as a travel agent, or a third party, as your card provider could argue it doesn't have a "direct relationship" with the supplier.
If your claim proves unsuccessful, you can take it to the free Financial Ombudsman Service.
Claim to your bank for purchases on debit card or credit card purchases of less than £100
If you paid on debit card, which is the card you get with your bank account, you might be covered by a different set of rules known as Chargeback.
Chargeback also applies to credit card purchases of less than £100.
The difference here, is that this is a service guarantee set-up by your card provider and unlike Section 75 it's not legally binding - so there are no guarantees you'll get your money back.
If you think you have a claim, contact your card provider directly - again, Which? has a free tool you can use to help you do this.
Just bear in mind that with Chargeback you usually need to claim within 120 days of making the purchase, although there are some exceptions.
The government's Money Advice Service also warns that Chargeback claims can take some time to process because the card company has to get the money refunded, in this case from Ryanair, before it can pass it onto you.
If this proves unsuccessful, you can take your claim to the free Financial Ombudsman Service.
More on Ryanair
Again, you're unlikely to be able to claim if your flight hasn't been cancelled because at this stage the service provider is still holding up its end of the bargain.
Claim to your travel insurer
You could also consider claiming for cancelled flights and holidays on your travel insurance if it provides such cover.
The downside with this is if you get your money back, you'll likely have to pay your insurer a fee known as an excess to get your cash.
Some insurers also stopped covering coronavirus-related cancellation so check your policy carefully.