Note: This cheat requires that you have the Airport Tycoon 3 patch installed. Also be sure to back up your files before making any changes.You can make all planes available by changing the date for when each plane is made available. Go to My Computer, C: Drive, Program Files, Global Star Software, Airport Tycoon 3, data, db, right click on the "planes" file, move down to open with, and choose WordPad. Find the date for when each plane will be available and change the date so that it will be available at the start of the game (the date is listed right after the abbreviated name for each plane and shows the month and year). For example, change a date of 3/1996 to 1/1970. Then save your changes.