Obvious enough that I had assumed craft = aircraft as well since you can "take the keys out" of ground/water vehicles. I was challenging the thought that every aircraft needs self destruct, as I suspect it's a minority. If as you say supersonic capability is the threat threshold, fighter jets/rockets would have them but a C-5 Galaxy and Blackhawk might not (I don't know, I'm speculating).
In this context, I meant craft = spacecraft. Our current space launch technology relies on extremely volatile and dangerous fuel. Until that changes, a self destruct will be found in all large launch vehicles[1]
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Obvious enough that I had assumed craft = aircraft as well since you can "take the keys out" of ground/water vehicles. I was challenging the thought that every aircraft needs self destruct, as I suspect it's a minority. If as you say supersonic capability is the threat threshold, fighter jets/rockets would have them but a C-5 Galaxy and Blackhawk might not (I don't know, I'm speculating).
In this context, I meant craft = spacecraft. Our current space launch technology relies on extremely volatile and dangerous fuel. Until that changes, a self destruct will be found in all large launch vehicles[1]
https://en.wikipedia.org/wiki/Launch_vehicle
The threshold is more "Is it an unstable flying fuel tank* ? y/n"
*or solid block of fuel