I mean for example, after reset you airport you get like +1% for speed for your service, or +1% for money farming. Each airport can have their own bonuses, even multiple bonuses after few reset’s. For each bonus before reset there can be some kind chain of task’s to comlete, handle some amount passegenrs, certain type of aircraft, or from certain airport, and etc. some bonuses can be apply to all airports, but to get them you need to comlete multiple task’s in different airport’s.
planes which are about to land or taxing also get reseted to land again so bad idea for huge airports like IAD,NGO.