Leeds Bradford Airport breached planning rules by operating hundreds more night-time flights than it was allowed to last summer, according to the local council.
Leeds City Council has given the airport a breach of condition notice, warning that failure to comply could lead to prosecution.
The airport has apologised and said it was taking steps to address the problems that led to the error.
The council began an investigation after receiving a complaint from campaigners the Group for Action on Leeds Bradford Airport.
The airport said it was an accident which it 'worked hard to put right'.
The council investigation found that during the 2022 summer season there were 3,667 night-time movements, 747 more than the limit that had been imposed.
Vincent Hodder, the airport authority's chief executive officer, said: 'On behalf of LBA, I sincerely apologise for the airport exceeding the permitted number of night flights in summer 2022.
'I want to reassure our local communities that actions have been taken quickly to address the problems that led to this error.'
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