Millions of passengers booked on Ryanair flights this summer are being warned that they can check in only 48 hours before departure.
The airline is making life tougher for travellers who choose not to pay extra for assigned seating.
Until two years ago, passengers could check in online up to a week before departure, which worked well for many people on seven-day holidays.
In 2016, Ryanair reduced the window for check in to just four days, saying the move was in response to "extensive customer feedback".
However, from June 13, just as the summer holiday season begins, the airline's check-in window is about to narrow sharply.
At present a passenger with a late flight at, say, 8pm on a Friday can check in from Monday morning onwards. But the new policy means free check-in will not open until 8pm on Wednesday.
Alternatively, passengers can pay a fee - typically €4 per person, per flight - for assigned seating, and will then be able to check in up to two months ahead of departure.
The change applies to existing reservations as well as new bookings.