[genbrien]

HFSX is a pack-mods collection created in the purpose to fly SEOW Campaigns: it is not focuzed on mods-managing like U.I. or SAS ones, so I strongly suggest you better you use those last ones mentioned packs to add/manage mods.

I dont know about adding plane with it, but adding general mods is very simple... as skyomish said, make a MODS folder and put it there :wink: