My Fallout skills are getting worse, i hope this is right...
1. Go to Vault City
2. Become a citizen
3. Talk to the doctor in the vault
4. When you are about to leave he asks you to smuggle in some jet, so agree
5. Come back with jet and give it to him
6. Come back again after a while and he will have it.
or
1. Buy it from San Fran...
You might have to do some other stuff in the first way, but that's how i do it if i'm actually a good guy for once...
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Play my chocobo racing game or get my evil walkthrough or something: www.geocities.com/whitechocobo666/