Passengers flying with Ryanair this weekend to the Heineken Cup final will face a €60 booking fee if they failed to check in online by 4pm today.
The Ryanair online check-in facility will be down from that time until midnight on Sunday as the company redevelops its website.
Ryanair has said passengers must carry their boarding pass with them or they will face a charge, €60 in the Republic and £60 in the UK.
The airline insists that people travelling with them check in at least four hours before flying and print their boarding pass ahead of check in or face the charge.
The airline anticipates carrying 500,000 passengers over the weekend.
Three charter flights carrying Leinster fans are due to depart today with a further 22 scheduled for tomorrow.
Overall, more than 17,000 passengers are expected to travel through Dublin Airport to London over the weekend for the Heineken Cup Final.
There are 25 additional flights running from the airport to London with almost 7,000 extra seats.
