Ryanair customers will not be refunded for flights in November, despite the UK government banning all but essential travel.
Rynair boss Michael O'Leary said if a flight was operating, passengers would not get their money back but they could change to a later flight without paying a fee.
From Thursday, all but essential travel will be banned under a second lockdown.
Ryanair said the first lockdown and subsequent restrictions had resulted in an 80% drop in passenger numbers.
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