Greater Rockford Airport
The Greater Rockford Airport is one of the places where many starters and trainers go to fly. This place is also home to the main ATC (Air Traffic Control) Tower. There is a cargo loading area at the northern part of the airport (west, if you look while going towards Mellor from the front). The airport tunnels through the gates have purpose whatsoever; so you can go in there.
The runways are 36R-18L 36L-18R