On Thursday and Friday, 22 and 23 August, as well as on 2, 3 and 4 September, flight crew employed in Britain by Europe’s biggest budget airline are intending to strike.
The Independent calculates that 500,000 people with confirmed bookings are at risk of having their flights cancelled over the five days.
The British Airline Pilots’ Association (Balpa) had invited Ryanair to start the week with fresh talks, but instead the airline is taking legal action in the High Court to challenge the legitimacy of the strike ballot.
The union now says: “Ryanair has blown the chance of finding a resolution before this week’s strike action.”
“Instead Ryanair is relying on legal technicalities to try to persuade the High Court to block the strike.”
The High Court case is on Wednesday, which means that passengers will not know until then if their Ryanair flights will be cancelled.
Balpa’s general secretary, Brian Strutton, called the airline’s move “just another demonstration of the bullying tactics the airline appears to favour”.
He said: “It’s also worrying to see Ryanair continue to sell tickets for strike days – are they prepared to offer compensation to passengers if they are affected?
“I think they should tell passengers exactly where they stand.”
Ryanair has not placed a warning about the possible strike on its website.