Ryanair has apologised after compensation cheques given to passengers have bounced.
According to the airline, several passengers have complained after they faced extra fees when their banks declined the cheques.
“We apologise again for any inconvenience caused to customers,” the group told the BBC.
The airline said that a “very small number” of cheques had been sent out without a signature due to an administrative error.
The cheques were reissued last week with a letter of apology.
Passengers took to social media to complain for the delays in receiving compensation because cheques had failed to clear.
“Ryanair sent me a cheque for compensation then bounced the cheque … ended up costing me €32 (£29) for the privilege. Shame on you Ryanair. Won’t respond to emails and operator just put the phone down on me,” wrote one customer on Facebook.
“Ryanair I would love to know why the cheque you sent me for compensation has bounced … Bank assure me this is your fault, wait 1 hour 20 on hold and your ‘customer services’ can’t help and there is no number to call to those who can? Please assure me of a call to fix this asap,” another wrote on Twitter.
According to the airline’s figures, over one million Ryanair passengers in Europe have had delayed or cancelled flights since April.
The Civil Aviation Authority has advised passengers caught up in strikes that they should apply for compensation.
Called the EU261, compensation is €250 euros for flights of up to 1,500km (932 miles), and €400 for longer flights in Europe and North Africa.
The airline said: “Ryanair complies fully with EU261 legislation, under which no compensation is payable to customers when the delay/cancellation is beyond the airline’s control.”
“If these strikes, by a tiny minority of Ryanair pilots, were within Ryanair’s control, there would have been no strikes and no cancellations.”
Shares in the group (LON: RYA) are currently trading down 0.59 percent at 13,42 (1025GMT).