the smart plane was programmed to skip section B since no documents relevant to the missing trillions of dollars were stored there, even Donald Rumsfeld was so impressed with that technology.
A greater manifestation of this technology was revealed
when tower 7 was demolished using imaginary and invisible planes
blasting all the supporting steel reinforced concrete columns
in the basement thus causing the building to implode.
The ability of these planes to travel through solid objects
and explode only when reaching the pre programmed object
is the due to the fruitful research of the deep (shit )state.

And absolutely no plane parts left behind.

Thermite and explosives. I mean did they get "freshly painted" around that time like the towers.