F the Flight School. I hate that sh*t, I've still nightmares from the stupid schools in GTA: San Andreas!
You probably just sucked at it.
Flight School was insanely easy in San Andreas & V as well.
The only reason for postponing flight school in SA was to hear Toreno's brand of pep talks & threaten Carl that Sweet would get the better end of 8 kilometers of wang courtesy of "Horse Cock" Harry if CJ didn't cooperate.
I have a real pilots licence but the plane in one of the GTA's 3? I couldn't even take off, it was absolutely horrible and wasn't like real flying at all. The new GTA5 looking at the jumbo flying, i can still tell that its too sensitive but not bad.