TIP #1

get to the airport in los santos the guy will say you are not allowed without a pilots licence well go to the right side of that little buailding of were that guy is and press square and youre guy will hang on to the side press up with the left analog stick ans simply when you on the roof run to the high gate then press square before getting off roof youre guy should make it over the fense then ther will be another fence a small one just hop it by pressing square