According to Wikipedia, there have been 60 hull-losses of 747’s, less than 4% of the total built. And many of these were hijackings, blown up, stuck by lightning, hitting another plane on the ground (Tenerife), etc.
Possibly a better record than the B-52’s.
Even one loss of a nuclear-armed aircraft is a disaster. That B-52 that crashed in Palomares Spain is still causing problems 50 years later.
747s are an overaged, weak aircraft. Criminally stupid idea.
C-17s would be a better choice.