The landings are super easy. You grind and do a bunch of regular landings to do a hard one, like one where lightning strikes your plane, but you probably get to do one of those for every 50 ordinary landings, and even the "impossible" ones arent that tough.
Also there is no rhyme or reason to the upgrade system. I just landed on this runway, why is it now telling me I need upgrades to my engines and passenger seats to land on it again? It seems that the upgrades are only there to regulate the pace of the game.
Dukane about Flight Alert : Impossible Landings Flight Simulator by Fun Games For Free, v1.0.4