The plane both exploded and had enough kinetic energy to punch to other side of the building. It hit the goddamned pentagon when flying over 800km/h, you can't expect any big recognisable parts to be found.
And no, you can't compare it to normal plane wrecks because usually, planes don't crash at max speed. Actually, usually, pilots try to do everything to avoid crashing or crash from stall/during landing/take off.
These pilots disbelieve the official story. Why do you believe the Feds when the experts dont?;