Ryanair and Jet2 have been named the most reliable airlines. How have they avoided delays and cancellations?
High passenger numbers caused chaos for airlines after pandemic travel restrictions were lifted earlier this year.
But while some airlines have to cut their schedules due to staff shortages and deal with strikes over working conditions, there are some that have quietly survived.
The two airlines with the fewest cancellations this summer, according to data shared by OAG, were Jet2 and Ryanair.
Ryanair has canceled very few flights this summer - even stepping in to offer "rescue" flights for passengers stranded by other airlines.
Ryanair boss O'Leary has said in the past that the budget carrier saw the recovery coming and decided to bring staff back early. He added that being based in Ireland meant the airline had not suffered from Brexit like UK-based airlines.
The other airline at the top of the reliability rankings, Jet2, says it has not had to cancel any flights due to staff shortages. It was the only airline in the UK not to cancel any flights in July.