Hey all,
XMountain is a BEAUTIFUL map and fits in beautifully with the current season where I live. With that being said, I've found a way in which you can get on top of the Airstrip. Obviously this isn't a flying map so this causes some problems if an Ion were to be placed here...
By climbing on the bunker, you can hop over onto the rocks
After getting to the rocks, you can run closer to the strip and get a good angle
From here it's pretty obvious you can jump right onto the strip