"The airport operator and airlines know where the passengers who travel through ABZ/EGPD are going to."
Really?
I travel to Alicante 4/5 times a year - since the demise of Globespan I go through BHX, LTN, LGW etc and book the cheapest onward connection, usually Flybe from ABZ, then Easyjet, Monarch, BMIBaby or whoever. I check the fares at Skyscanner.net which then sends me to the individual airline website - I don't see how anyone at ABZ can know my final destination, and I know I'm not the only one who books using this method....