Is there a way to make 2 objects "flyable" at the

I have two addons from Vertigo Studios, their excellent F6F Hellcat and the USS Enterprise (CV6).  I would like to fly the Hellcat off of the ship.  Unfortunately, the ship goes into FSX as an airplane and will not come up as a ship or as addon scenery.  I'm stumped.  If you have any ideas, I'd be most grateful.
BTW, VS has not answered my emails.  Are they still in business?