Hey LM,
If you wanted to use a primer I would use a gray myself. Not only does it help you see any flaws like seams,scratches scuff marks and the like but when you apply your balck paint to the a/c, the gray will bring out the blacks truer color instead of appling the scheme to an already black molding.
Heres a site that might help ya out
http://www.dreamlandresort.com/black_projects/f117_photos.html
Flaps up, Mike
If you would listen to everybody about the inaccuracies, most of the kits on your shelf would not have been built Too Close For Guns, Switching To Finger