I couldn't find the Fokker DVIIF for sale

[WM_KMS]

But it's listed in PWCGFC as a plane owned, missions will not create with the Fokker DVIIF, it returns an error "Player does not own"

[=IRFC=Gascan]

This probably belongs in the Missions and Campaigns section of the Flying Circus forum, where PWCGFC is located. Isn't there a menu where you can tell PWCG which planes you own? It's mostly applicable for the WW2 content, but I think it's still present for FC, especially since FC2 is on the way.