Ryanair cancelled flights until 2 March
Airline Ryanair said it plans to sue Cornwall County Council over the closure of Newquay Airport.
It said it was working out a figure, but the claim would include the damage to its reputation, because it had to cancel flights at the last minute.
The county council said it could not comment on a contractual issue.
Newquay Airport was closed to flights in November because of a delay in an aviation licence being granted to the county council.
Cornwall County Council, which owns Newquay Airport, had been due to take over air traffic operations from the RAF on 1 December.
But the airport was closed until 19 December for work to meet Civil Aviation Authority standards.
As part of its take-over operation, the council had to resurface the runway, build a new air traffic control tower and improve security.
However, the CAA deemed the works were not suitable at the beginning of the month, when the licence was due to be issued, and it delayed its approval.
As a result, Ryanair cancelled its flights between Newquay and London Stansted airport, until 2 March.
An estimated 7,000 passengers were affected by the closure and had to use alternative airports, including Plymouth, Land's End, Bristol and Bournemouth.