detachable cabin system
An old idea, tried on the XB-70 Valkyrie, and implemented on the 1960s production F-111 bomber. https://www.youtube.com/watch?v=9gyIhOGyGA8h
But then military aircraft are often hit by missiles at altitude, unlike airliners - although I guess that is sadly rather less true in the Ukraine than elsewhere.
BTW I'm an inventor too - I've got this great idea for vertical circular disk rotating around a horizontal load bearing shaft which allows heavy objects to be moved easily.