Airline TUI says it has learned from flight delays and cancellations that hit holidaymakers over the past two months.
In an email to customers, TUI said flights over the past week have been running mostly as normal - although there was disruption at Newcastle Airport - and the operator is working closely with partners to address the issues. But there are fears the disruption, which has affected airlines including Ryanair, British Airways and EasyJet as well as TUI, could be repeated when the school holidays start.
Passengers hit by cancelled flights have even been asked to return their duty free shopping, under a little-known rule, leading to a "chorus of laughter" from holidaymakers stranded at Bristol Airport during the chaos.