Here in Nice, France our airport has a really nice and useful loyalty program called Club Airport Premier.
Every time you scan your card and boarding pass at designated kiosks you earn 100 CAP points (only works for outbound flights and not arrivals). You also earn 1 point per euro spent on parking, fast track / lounge access purchases and when shopping or eating at the airport restaurants or duty-free.
Once you reach 1000 CAP points you will be reach Gold Status which gives you free fast track security, automatic registration of your flights to CAP when going thru fast track (no need to go to a kiosk) and almost half price off lounge access (€16 vs €30).
There's also a Platinum Status but I don't think there's much benefit to it over Gold.
(PS : Not affiliated with Nice Airport just a happy Gold CAP Cardholder)

More Info : Benefits / Club Airport Premier / Business travellers / PASSENGER INFO - Aéroport Nice Côte d'Azur : gateway to the mythical French Riviera