This is Such an awesome game. For those who have trouble landing, stay almost horizontal with a slight tilt to let the back wheels touch first, maintain speed until you hit the ground, and use land flaps. If you land in front of the airport, simply taxi in.
i think that the later levels become extremely hard (alien) without ramping up the lag as all enemies have some super aim/super snipe ability that connects most every shot even when ur off screen in comparison to their pov. I like the game though, im having truble wit the alien lvls though, because of the problems afore mentioned and the fact that a not all too powerful weapon becomes a 2 or even 1 hit kill even with shields, whereas the enemy has amazingly powerful armor, even surviving direct rocket hits.