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This is a way to get the rustler in a mastersave game (before first mission). It might be possible to get it right at the very beginning of the game but having a pilot licence will let you enter the San Fierro Airport without much trouble.
Some tips though before towing the rustler from the airport lure the cops into the hangar next to the one where the plane is. When you get to train track avoid the tracks as much as possible because the bumps most of the times make the plane blow up, and keep as close to the highway as possible and the cops might just spawn on top of the highway making it easier to travel with the plane. When storing the rustler try backing up the more you can into the garage with the help of the tow truck and then just finish pushing by foot, also note that if you let the garage door close with the plane not deep enough it will vanish. Beware of the cops of course, I was really lucky with mine because the swat shot a few rounds on the plane and didn't blow up and they almost killed me but it was just that "almost" 9:30. LOL
There's is another tip when near the doherty garage try luring the cop cars under the train station which is also a good way to avoid the police mavericks, sometimes the cars get stuck there and they won't interfere with the storing of the plane leaving only a few cops on foot.
PS. After geting the rustler you might want to take it to the San Fierro impound thus leaving the doherty garage available for other vehicles. Just tow the rustler out of the garage, I personally prefer towing it under the train station and using the cement platform between tracks to take off with the plane. Again avoid the police and specially avoid the hydras when flying.