I also found this!
In the September 1999 issue of Popular Mechanics magazine there
is an article entitled "Skunk Works Magic," written by Jim
Wilson. The article is basically a history of the famed Skunk
Works founded by aircraft designer Kelly Johnson, and describes
many of the cutting edge aircraft produced there.
However, towards the end of the article, in a paragraph entitled
"Future Planes" there is a description of a secret aircraft
called the stealth blimp. I will quote the article here:
"Tales of mystery craft continue. There have been scores of
sightings of a 1000 ft. long stealth blimp that supposedly
carries a massive phased array radar. The craft is said to
disguise itself by using "optical stealth" technology that
creates an image of a floating star field."
An accompanying illustration shows a large, triangular black
craft, thin in profile, that looks nothing like the conventional
blimps we are used to.
If this aircraft is genuine, then I would assume it is fairly
slow moving and silent, and may be responsible for many UFO
reports concerning unknown triangular black craft. I have read a
number of reports recently on this list that would match its
description. I am in no way attempting to say that this vehicle
accounts for all those sightings, but there is a good chance it
may have been the cause of several of them. An interesting
possibility to ponder in any case.
Source - Stealth Blimp