Grand Theft Auto: The Trilogy Cheats

When one of your controlled territories comes under attack, head to any safe house and save your game. After the save is complete, the attack will have been stopped, and you will still control the territory.

Hop into the SHAMAL at Los Santos airport and fly it for 25 minutes. It will say to keep practicing for a pilot's license. Fly for 10 more minues and you can access all airports and get a pilots license