flying near 20,000 feet the craft could probably change altitudes to find the the best prevailing winds. There also may be enough electronics on board to allow the air ship to be refueled by flying tankers. Afghanistan probably has aircraft that can fly to 20,000 feet to fire something large enough to pop the ship, or at least hit it with a heavy metal projectile.

Isn't that like saying that someone with a gun can't kill you unless you are intended to stand in the line of fire. This is an evil weapon. An electronic device that can created a 151 decibel beam over a mile has to be much louder the closer it is to the source. For this reason OSHA should have the authority to demand that the military not use them. Any creature, human, animal, or plant that happens to become in the line of the beam can be seriously harmed. Peace!