Low-cost airline Ryanair has warned late plane deliveries will force it to cut its flying schedule.
Ryanair expects flights to get back to normal in April
As a result, the Irish carrier expects to receive 100,000 fewer passengers a month between January and March.
It blamed a strike at manufacturer Boeing earlier this year for the problems, saying the action had delayed delivery of four aircraft by a month.
Ryanair added the problem would have little effect on its profit forecasts for the year to March.
It added that the company had been using older planes to cover flight schedules since October, but the aircraft would soon be out of commission and could not be used in the new year.
Ryanair said it expected flight timetables to then return to normal after the expected delivery of the new aircraft in April.
Deputy chief executive Michael Cawley said the airline "very much regretted" having to axe flights.
"We apologise sincerely to all our passengers who may be inconvenienced by these schedule changes, and we look forward to welcoming them on board the new flights ... when the new aircraft are delivered and based there during April 2006," he added.
"These changes will not affect Ryanair's profit guidance for the fiscal year."
In November, the company said it expected full-year profits before one-offs to come in at around 200m euros (£135.7m; $239.2m).