Having just failed to kill you, Gonzalez is now asking for your help. He has switched sides from the Colonel to Diaz.
You must escort Gonzalez's truck to the airport by helicopter, although you're not flying, you're manning the guns.
Shoot all enemy vehicles before they get a chance to take a shot at Gonzalez's truck. It's quite tricky to target vehicles when you're helicopter is continually turning, but with practice you'll get to know where the targets will come from and where the helicopter is about to turn next.
The truck takes the most damage on the main north-south road before the roadblock, so make sure you're ready to take out the vehicles that surround the truck quickly. If the truck doesn't take major damage here you stand a good chance of making it through the rest of the mission.
Take out the three vehicles in the roadblock, then the cars that swarm in as the truck heads west. Once the truck makes it into the airport you've done the hardest part.
The next set of targets are a leisurely picking off of cars as they turn up outside both the south and north entrances to the runways.
After the second pass at the south gate you'll then head back to the north to take out the cars chasing Gonzalez' plane as it races to take-off. Pick off each car in turn. Move on to the next car as soon as you see flames coming from the engine. If you're quick enough they won't be able to do enough damage to the plane to stop it from taking off and you've passed the mission.
The minigun is now available from the Vice Point Mall Ammunation.