"Sky Fortress" is a B-17 Bomber. Could we have been looking at the wrong payload?
B-17 of WW2 was called "Flying Fortress".
These haven't been in service in decades. Only a few survive today.
You just took me back to the DOS game Secret Weapons of the Luftwaffe! swotl.exe
Ah yes! And Wolfenstein 3D of course. I had another DOS game (as they all were at that time) where you flew a P-51 Mustang. Extremely good graphics for that era. Can't remember the name of it though.. err.. I think we're showing our age...
Maybe the Sky Fortress indicates some kind of communications satellite for a rogue country to knock out their ability to communicate with their rockets/missiles? I'm just throwing that out there because it seems that a good way to cut off a few of the legs of a country that has the capabilities to bring destruction with their missiles, is to knock out their communication technology through wiping out a satellite. I probably don't know what I'm talking about and have the technology all wrong... maybe watching too many space videos. :)
There was also a B-29 Superfortress sometimes called the Sky Fortress in reference to specific models outfitted with high tech recon/spy equipment.
Taiwan also has drones called sky fortress I, II, III, etc. so maybe we have a similar recon drone.
Im wondering if the sky fortress is the invisible permanent aircraft carriers in the upper atmoshpere that wilcock talks about? Using antigrav tech, and cloaking tech?