Where's the evidence that a commercial jet hit the Pentagon?
Debris was recovered from the scene.
Crash scene witnesses
A USA Today article reports the discovery of "scorched bodies of several airline passengers" "still strapped into their seats".
Personal effects relating to Flight 77 passengers were reported discovered at the scene:
The Pentagon victims and Flight 77 passengers were identified by DNA:
Additional work was carried out on the unidentified remains:
The FBI told us that brothers Nawaf and Salem al-Hazmi were on board Flight 77. Testing reveals two of the DNA profiles appear to be taken from brothers. (See Hijackers DNA profiles.)