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(just look at the Aloha convertible, where more than 50% of the fuselage structure was missing yet it still held together).
Not at all comparable - the skin unwrapped but all the load carrying stringersm and floor beams and circumferentials were intact
IN an explosion as postulated, depending on location, several major members would likely be destroyed. If carefully located a small explosive could sever for example a major structure member in the tail section and get the result. Or even poor maintenancece - as the 747 over japan demonstrated re tail .
I was thinking about the same. Aloha's initial event that caused shedding of all cabin skin started from roof and progressed rear and downwards until stopped by stronger fuselage-floor interconnection. Surprisingly noone seated didn't get unjured by flying parts. it means everything was peeled outward.
with metrojet a321 initial breakup should have started at the floor level, on the left side. Not far from wings. Thus peeling below and above floor level destroyed floor as well throwing out seats one by one.