Ryanair has warned customers that its website and app will both be offline later today.
The services will be unavailable from 6.30pm this evening until 2.30am on Thursday morning as they work to upgrade their systems.
Customers will not be able to check-in online and any new bookings or changes to existing flights will not be possible while the system is being worked on.
Ryanair’s Robin Kiely said: “This web closure and systems upgrade will take 8 hours, from 18.30hrs (UK time) on Wednesday 22nd March, until 02:30hrs (UK time) on Thursday 23rd March, during which time our online check-in service will not be available. Flight bookings and changes will also be unavailable during this period. Customers travelling on Wednesday or Thursday should check-in for their flight on Tuesday, 21st March. We sincerely apologise for any inconvenience caused by this upgrade, which will further improve Ryanair.com, Europe’s largest travel website, as we continue our path to becoming the Amazon of Travel.”