An elderly couple were "horrified" after being charged £110 by Ryanair to print their tickets at the airport.
Ruth, 79, and Peter Jaffe, 80, told the BBC that they had to pay the fee after they mistakenly printed their return tickets before leaving home instead of their outgoing tickets.
It sparked a flurry of social-media complaints about the airline's fees.
Ryanair maintained the charges were in line with its policy.
But consumer rights expert Martyn James said the couple's experience had "touched a nerve" as many other people have also been hit by unexpected charges.
The Jaffes were flying from Stansted Airport to Bergerac, France, last Friday.
Ryanair has chosen to criticise the passengers rather than apologise
Wrong tickets
Mrs Jaffe said she found Ryanair's website "very confusing", but despite this she thought she had successfully managed to print their tickets the day before the flight. It was only when she got to the airport that she realised she had accidentally printed the wrong tickets.
"I was then told that I had to go to the Ryanair desk to get a boarding card, and there they charged me £55 per person," she said. "(I was) horrified."
She added it wasn't easy for her husband to walk from one bit of the airport to the other. "I was quite flustered and upset."
Mr Jaffe said that they had no choice but to pay, as they had people expecting them in France.
On Sunday, their daughter posted on X, the social network formerly known as Twitter, saying her mother had made "an honest mistake".
"£110 for two pieces of paper which took 1 minute. Shame on you," she told the budget airline.
Ryanair said in a statement: "All passengers travelling with Ryanair agree to check-in online before arriving at their departure airport and all passengers are sent an e-mail/SMS, reminding them to do so 24hrs before departure.
"We regret that these passengers ignored their e-mail reminder and failed to check-in online."