Published Tariff
Fly Through
The published tariff is pretty much irrelevant at virtually all UK airports these days. It's probably only at Heathrow that airlines pay as per the tariff. At other airports - even Gatwick now - airlines generally pay on the basis of commercially negotiated bilateral deals.
At airports where the pax traffic is on LCCs the charges are a fraction of the published tariff, and are generally on an 'all-in' basis per departing passenger (covering the landing fee, ATC charges and passenger service charges). At Prestwick the charges payable by Ryanair probably fall in a range of £0.50 to £1.00 per departing passenger.
At such prices it's difficult for an airport to make money from pax operations, even with the commercial revenues from car parking and retail/catering etc. Historically PIK has washed its face from non-pax revenues but it seems that's getting increasingly difficult.