User blog comment:LegenDove/The GTA Online San Andreas Flight School Update Now Available/@comment-26141873-20140823043702

I think the best way to earn money in this update is by repeatedly completing Flight School with all gold medals. To do this, you should create a second character, reach rank 9, earn all gold medals in Flight School, bank the reward money, delete the character, then repeat as many times as you want. You'll get at least $232,500 every time, along with about $50,000 extra for the amount of missions you need to do to reach rank 9.