[familyop]

Most aircraft hit in engines by such FOD would land anyway.

[Seizethecarp]

“Most aircraft hit in engines by such FOD would land anyway.”

Yes, but loss of an engine could prevent the aircraft from “going around” or responding to numerous situations optimally requiring two engines. Terrorists deploying multiple drones or even coordinated swarm could cause pandemonium, which is, of course, what they seek.