Budget airline Ryanair is going ahead with plans to shut its entire booking system for the weekend.
The booking website and call centre applications for the Dublin-based operator will be unavailable as Ryanair migrates to a new reservation system.
Neither online nor telephone customers will be able to book flights between 10pm today and 11pm on Monday while the reservations network is upgraded. During this period, web and phone customers will not be able to make, check or change bookings, and will not be able to check in online.
In a statement on its website, Ryanair said: "Navitaire, our booking system provider, will be managing the transition to their new servers and flight booking software." Navitaire is the distributor of the reservation system, called New Skies.
The Office for Fair Trading (OFT) recently called on Ryanair and other airlines to clarify fare prices on their websites. The regulator has ordered the airline to include unavoidable fixed costs such tax in its ticket prices.
But a spokesperson for Ryanair denied the weekend's work was related to the OFT ruling.
"This work has been planned for more than 12 months. It is to increase the capacity on the website to handle increased demand," she said.
The airline, which recently revealed a 27% drop in third-quarter profits and warned of lower profits, said the booking shutdown would not affect flights this weekend.