Anyone who has recently booked a flight to Spain with Ryanair will get a second charge to their credit or debit card in the next few days to pay for the recent increase in Spanish airport tax, according to a news item on the Ryanair website.
Any Ryanair flights to Spain after July 1, booked before July 1, will be subject to a retroactive fee.
The additional charge could be anywhere between 1.87€ and 9.11€ per passenger, per flight.
If you do not wish to be charged, you must cancel your flight today, July 15, 2012 using this link: Cancel Your Ryanair Flight. (My apologies for the last-minute warning - I only just found out about this.)
No other airline is making this retroactive charge.
Regular readers to this site may not be surprised by this move by Ryanair. The airline is infamous among air travelers in Europe for adding extra fees to its passengers - either during the booking process or at the airport itself. With Ryanair, the price you see when you start your booking is often not the price you pay. Read more about Ryanair Charges
See also: Ryanair Hand Baggage Rules - surprising pictures of the behaviour of baggage handlers on Ryanair flights