You would bet wrong. 20K ft is 4 miles.
Largest round in this house is .50BMG. I paid the price of a small Kia for the scope and subsequent mods by the factory.
One mile, if I hand it to someone that can actually see, and we use the $5.00/round Arizona Ammunition precision rounds that I stocked up on back when they were only $5.00.
Russian SAMs might hit it, but Kadaffi won't vouch for them. He wanted surface to airplane missiles, and the Soviets kept sending him surface to air missiles.
There's a reason they aren't called hittles.
/johnny
Alright, but someone commented upthread that at high mountain altitudes, it would be possible to hit these airships with something the Afghans already have.
I'm out of my depth on the science and ballistic technicalities involved here. Just commenting on what I'm seeing from more well-informed posters.