The airport is a airport with a place for cars to Drive, A parking Space, Ramps, and Planes.
It has Ramps that cars can go on and it is accessible from the off road and city through tunnels and also on top of the City one is one of the last secrets. You were able to go into pits from that place and go to the city or off road. You can not now so to get out, you should reset the game. There is a ramp in the Airport that can let your car go almost upside down. There is also things that you can Jump and go on and also a garage. There is a road around it. There was another secret by going into a deep curve with ramps in the middle and goin out in mid air and getting out of bounds.