Humans aren't as regular as to allow this. The Mombasa attack failed because the pilot chose a different path that time, and that was an 'easy' attack (takeoff

Humans aren't as regular as to allow this. The Mombasa attack failed because the pilot chose a different path that time, and that was an 'easy' attack (takeoff where the plane is slow, using military-grade AA missiles far quicker than any drone).