alt Hacker NewsThere’s evidence that not all people involved in 9/11 knew they were going to die. Yet, they were still used effectively.
Significantly less dedicated supporters are generally used as a funding source, but actual terrorist organizations have also used them for publicity events on the anniversary of attacks.
You are dodging the fact that getting a handful of planes to turn around is an act that induces frustration, annoyance, and insignificant costs at best. Not terror.