ILS27
Have you actually thought about what you are saying?
The terrorists blew up at the point before security.
They can do that no matter where you put security, because that is where you actually have security.
This has to be indoors for obvious reasons, and will obviously involve lots of people with bags.
No matter where you do it there will always be a big room full of people where you go through security.
It makes no difference how far from the aircraft you put security. There will always be a point for them to strike.