Hey, that sounds pretty cool; I thought it turned your car into a vertibird.
It looks like they beat me on the idea,I was thinking of placing a pilot in Navarro who agrees to fly the vertibird for you once you wipe out Navarro base.
The way I thought I might make it work is like this: the vertibird only flies you from Navarro to a specific city or other important location in the map; there would have to be no encounters on the way an instead of taking you to the worldmap, it would be based on a caravan guard quest script; just fade out the screen and let time pass then you would appear at the main map of your destination and the pilot would be standing next to your party waiting for you and you get the option of him taking you to another city or you can send him back to Navarro base;( the vertibird of course would not be seen) and last when you arrive in Navarro the pilot, you and your party would appear next to the vertibird in the main base map.
I am a bit busy with other projects so this one is one of too many cluttered up in my to do list and I need to learn a lot more about scripting before I even attempt it.