Jet2, altough with a choice of airport check-in at a higher fee, offers online check-in at a price as well, and if you don't print the boarding card you have to pay 17,50£/24€ at the airport. The passenger is only advised of this charge at the booking confirmation where there's a box saying "Not printing out your boarding card MAY result in you having to pay an additional fee at the airport". The charge doesn't apply to infants, children or passengers that need assistence though. I'm not sure if the fact that they offer the check in type choice makes any difference on the way they charge the boarding card print fee at the airport like Ryanair...