Today I stripped AFS 2, to find two airfields in Switzerland, or at least two runways, which were forgotten for AFS4 which are Ulrichen and Interlaken.
Here's how and where to find these two folders.
C:\Program Files (x86)\Steam\steamapps\common\Aerofly FS 2 Flight Simulator\scenery\airports\ch\
and copied the two folders, lsmc_ulrichen and lsmi_interlaken, then pasted them in:
C:\Users\Documents \Aerofly FS 4\scenery\airports\places\lsmc_ulrichen...lsmi_interlaken
However you will have to manually select your starting position:
LSMC Ulrichen: N 46.50° / E 8.30°
LSMI Interlaken: N 46.67° / E 7.87°
Try and enjoy!