Holiday giant Tui is cancelling more flights as air passengers face ongoing disruption ahead of the Jubilee bank holiday weekend.
Tui will cancel six flights a day until the end of June, affecting around 34,000 travellers in all.
Other airlines have also cancelled flights, as around two million people prepare to fly over the next few days.
One family, whose flight was cancelled with less than two days notice, said their children were "devastated".
Joanna Chandramani said she, her husband and their seven-year-old twin girls had been set to fly to Turkey on Wednesday, but she got a text on Monday evening telling her their holiday was cancelled.
Ms Chandramani said Tui had now offered them vouchers but the family did not want to re-book with them so were flying with Jet2 to Mallorca instead.
"We have lost all faith in Tui," she added.
Tui said customers affected by cancellations would receive a full refund for their holidays "as well as an extra gesture of goodwill".
The company said the cancellations represented about 4% of its flights.
What are my rights if my flight is cancelled?
Thousands of passengers across the UK have had their flights cancelled or faced delays at airports when checking in and collecting baggage as the half-term break began.
During the first two years of the pandemic, aviation ground almost to a halt and the industry cut thousands of jobs. Airports and airlines have struggled to cope with a surge in flyers as travel picked up again.
Prospect, the union which represents staff across air traffic control and in aviation engineering, warned that things could "get worse before they get better".
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