It depends on the airport.
There are actually TWO fees you need to worry about: landing fees and parking fees. A landing fee is a charge to use the airport's runways and taxiways, which belong to...
Head south towards the city of Dublin from the airport. Join the M50 motorway at junction 1. At junction 9, take the R110/N7 exit to City Centre. Keep right at the fork, following signs for Cluain...