My assumption of the use of a less expensive aircraft ie: Cessna 180 (granted, short range)was based on the fact, hopefully not, that a suitcase TacNuc was to be delivered.
I personally believe that a suitcase TacNuc will be used
for an attack on the US. I understand that a few of these devices are loose out there after the USSR Armed Forces folded up. I understand that the missing ones were stored
in the different "stans" surrounding Mother Russia.
We are living in interesting times!
The Cessna can fly at 12,000 easily. More if you bring oxygen, which is available. If memory serves correctly, you're supposed to pop an air burst around 10,000'.
Anyone with better info, please add . . .