I'm responding on my phone currently. When I get to my PC I will try to post the ad4 file. It is stock and it isn't. KMDT, Harrisburg International is one of the airports on the Orbx Freeware list. The main reason I modified it was due that the designer had set up GA parking on the PA ANG ramp at the south end of the airport. In real life you better not try parking anything there unless it's a c130 or an occasional C17 or sometimes the VC125 if the president visits. So, I positioned GA parking where I know it to be and then I noticed missing gates at the main terminal so I added the ones that are missing. Then I did some snooping to find out what airlines use what gate assignments and when I went to set then I noticed all of them were set for 135 Airways. HIA handles American, Delta, United, Allegient, Jazz, etc.