DAA have a set charge per departing passenger depending on weather it is remote of contact stand. Ryanair would have no case.
Wrong end of stick there Jamie
Ryanair had a dispute with DAA who wished to charge for desks and space around them and then when Ryanair had check in Kiosks a number of years ago also to charge for the kiosks even though the space was already paid for.
Mind you DAA not the brightest in the world given their development of checkin areas when airlines are going preprinted tickets.