Many complain about the extras, hidden or otherwise, with the so-called low cost airlines: baggage charges, insurance, charges for online booking when it is the only option available etc.
I was surprised, to say the very least, to find out that Flybe now charge you for a seat on the plane as an ‘extra’, six pounds each way on a trip from the UK to Spain. There is, of course, no alternative option but to purchase a seat!