No frills airline Easyjet has apologised after about 4,800 passengers were delayed by an administration blunder which delayed 40 flights.
Forty flights were delayed
The aircraft were delayed on Saturday after insurance documents were not placed on the relevant planes.
Passengers embarking on their bank holiday getaway to continental Europe and UK destinations were affected, with Stansted and Luton the worst hit.
Knock-on effects meant a further 14 flights were cancelled.
Passengers due to fly on those were transferred to other flights and the company said it was "working to avoid" delaying people until Sunday.
The disruption came because vital insurance renewal documents were not placed in the aircraft.
The blunder was discovered at around 6.30 BST on Saturday morning.
All affected planes were due to take off by 10.30 BST, head of corporate affairs Toby Nicol said.
While services from Luton and Stansted were hardest hit, Newcastle, Liverpool and Bristol were also affected.
Mr Nicol said the company would hold a "full and immediate" inquiry into why the documents were not on board but Saturday's priority was to get people to their destinations.