Passengers on the Irish no-frills airline Ryanair are set to face another new charge from Friday.
The airline is bringing in a 2% credit card processing fee on all new credit card bookings made with the company.
The budget airline said it was making the announcement in order to comply with a recent Office of Fair Trading ruling.
Ryanair also announced that from Friday its passengers would have to pay a £6 administration fee to cover the airline's website costs.
The only exceptions will be bookings made using Ryanair's "cash passport" scheme in Ireland, Germany and Spain, where administration fees can be avoided until 1 February, 15 February and 21 March, 2013 respectively.
Ryanair said it was continuing to "deliver the lowest fares and a no-fuel surcharges guarantee to all our passengers" and that passengers could avoid credit card fees by paying with a debit card.
However, the Office of Fair Trading said: "We have not required any airline to introduce new payment charges, increase their credit card charges, or scrap any discounts they wish to offer.
"We took action to make sure that debit card charges are included in the headline price and credit card charges are transparent and not sprung on shoppers towards the end of the booking process."
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