nice level on difficulty increase... once you get a hang of the controls its pretty easy... simple you of making sure you keep control of plans is just dont click plans going into hanger only those spawning for taxiing... its not hard to remember where they spawn from and so you know whether they are coming or going.
whats up with the CONTRA achievement... its really tempermental... it doesnt matter how many times i type contra it seem to chose when it works and when it doesnt... what am i doing wrong???
 "Airport Madness"){kind=icon}
 "Ski Chalet"){kind=icon}
 "Medical School"){kind=icon}
 "No Signal"){kind=icon}
 "Switchball"){kind=icon}
 "Animal Shape Finder"){kind=icon}
 "magic card game"){kind=icon}
 "Tourist Trap"){kind=icon}
 "Grid"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "Funky Ball 99"){kind=icon}
 "Monkey GO Happy"){kind=icon}
 "Mechanical Commando"){kind=icon}
 "The Perfect Ricochet"){kind=icon}
 "Fishing Girl"){kind=icon}