First you need to unlock the Fast Travel perk in the bottom right corner. Then you need to Enough money that you'll get negatives for example 500$ dollars would be good. YOU HAVE TO GET NEGATIVES!!!
You have to fast travel near the airport. As you can see this picture isn't as close as you can get to the airport. if it doesn't work look up a youtube video.
https://www.youtube.com/watch?v=Ci_aDYmDB0s
DISCLAIMER I DON'T OWN ANYTHING I JUST TALKED ABOUT
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Forza Horizon 2 Money Glitch
RandomThis glitch really does work. Only works on xbox 360. Gets you 999,999,999. Completely awesome!!!!