Ryanair has confirmed that its online check-in service will not be available for a ten hour period this Friday and Saturday.
The airline's website and app is to "close" for 10 hours from 19.00 (GMT) on Friday, June 19 to 05.00 (GMT) this Saturday, June 20.
The website and app are closing "for a systems upgrade", the airline said. Independent Travel has learned that the maintenance is to its online booking system.
The airline's online check-in service will not be available during the 10-hour period, and Ryanair is calling on passengers to check-in online for their flight on/before Thursday, June 18.
New bookings or changes to existing flights will not be possible during the web closure.
Ryanair is contacting all intending customers travelling this Friday and Saturday by email and SMS text to advise them to check in online on/before Thursday to avoid disruption.
"We sincerely apologise for any inconvenience caused by this upgrade, which will further improve Ryanair.com, Europe’s largest travel website,” its Head of Communications, Robin Kiely, said.
Ryanair.com has 1.2 million unique visitors a day.