“757 can fly on one engine”
As discussed in the other thread, if one engine gets knocked off the wing, the airframe becomes unstable. This has been the experience in bird strike and other situations where the turbofan explodes and goes off the pylon. Several 747 and 2-engine wide-bodies have been lost due the bird strikes when thrust on one side of the airframe is lost on a plane that is supposed to fly with loss of one turbofan.
Drone strikes, intentional or accidental, could be expected to be similar or worse due to very hard parts in some drones compared to birds.
I also thought of the comparison to “bird strikes”. But modern turbofan engines can take a hit — at least by a single bird — so I think a small X-wing quad copter would be similarly shrugged off.
The miracle on the Hudson River? There I think Sulzberger’s plane hit a flock of migrating birds. I may be wrong, but where ducks & geese are involved at that time of year you’re seldom looking at a single strike.