No-frills airline Ryanair has missed a deadline for removing misleading prices from its website.
Last August the Office of Fair Trading (OFT) took action against 13 airlines that failed to include taxes and other charges in headline fares on their websites.
Both Aer Lingus and Ryanair said they needed extra time to amend their sites because of technical difficulties.
Both were given until the end of January but only Aer Lingus has so far made the changes.
The OFT says that Ryanair was then given an additional deadline of 15 February, which it is also set to miss.
An OFT spokesman said: ‘We are very disappointed that Ryanair has not met the agreed date of 31 January for changing its website.
‘Ryanair has informed us that it experienced serious technical difficulties during testing that would have prevented its booking system from functioning had the changes gone ahead by 31 January.
‘However, Ryanair has informed us that the changeover to its new system will be on 22 February.’
Ryanair’s entire booking system will be shut down between 10pm on Friday, 22 February, and 11pm on the following Monday, 25 February.
The airline’s free web check-in service will also not be operating during the bookings system shutdown.
However, any passengers affected by this will not be charged the £3 airport check-in fee.
Access to Ryanair destination information, travel questions, car, hotel and insurance booking facilities will be available online during the weekend.