Flatten airports in X-Plane

Some airports in X-Plane have terrain issues that can be quite entertaining. This Delta 737-800 got lost in the maze of cargo ramps at PANC and was trying to taxi back to the terminal when it encountered a steep icy taxiway. It required 65% N1 just to get up the slope. Clearly a fix is required. It turns out to be quite simple. In the global airports file apt.