Where is the airport in GTAvicecity?

Answer 1

The airport is located on the other large island that is available later in game play.
It is the western most island and can be easily found by taking the southern most bridge (it goes directly across to the western island) from east to west and then making a left turn and then the first possible right turn and following that road down. After it curves right and then left you will surely be in the airport area.