just cruised around your Manhattan Airport.
The Good: Everything is level with the limits of long KSP runway, i.e. there are up to a 4 meter height differences from one end of a runway to the other. Taking off is no problem. Landing? well, its KSP.
The Bad: nothing functional is broken although if the fuel tanks by the hangar are supposed to allow the purchase of fuel, i cannot select them. This would be a Kerbal Konstructs function not stock KSP.
The Ugly: The airport is floating above the ground, particularly the Hangars, control tower and windmills. I think there are way to level the ground so you do not need berms but I am relatively new to KSP and have not attempted such a thing yet.
The runway number is a small thing but should be changed when you can. All the runways are currently numbered 09/27. I realize this is the stock texture from KSC
Here is a short list of runway information that I assembled;
RW 30 Heading 301 alt 479m (spawned here, no problem)
RW 12 Heading 121 alt 483m
RW 03 Heading 028 alt 479m
RW 21 Heading 208 alt 480m
Thank you for your efforts.