In preparing for the Airline and Travel Payment Summit in Toronto on the 12/13th of October 2011, one of the themes that keeps emerging is payment surcharging. In the UK, where I am based, this practice very advanced, but it's also one which the regulators are also looking at closely.
Although Ryanair is registered in Ireland, it does a lot of business in the UK and it's at the forefront of surcharging here. However, they are not alone. You might be surprised to learn that Lufthansa and American Airlines are also surcharging on their own UK websites for credit card payments.
Here is a chart of airlines charging credit card surcharges in the UK market: