So you know for sure everything the US government and military own and what they use it for.
Maybe but not all...
http://news.bbc.co.uk/1/hi/world/americas/4147958.stm
In December, 2005, The Power Hour interviewed aircraft experts about the South Tower crash aircraft:
Col. George Nelson USAF (ret.), who has 30 years of experience identifying aircraft and aircraft parts stated, “The plane that hit the south tower on 9/11 was not United Airlines (UA) flight 175”. After reviewing numerous video clips and photographs of the 9/11 attacks, he concluded, “That was not a commercial airliner. The planes were substituted.”
Glen Standish, an airline pilot for over 20 years stated, “The plane seen in various video clips of the attack could not have been UA flight 175, due to the extra equipment that appears to be attached to the bottom of the fuselage”.
Nila Sagadevin, a seasoned airline pilot of over 20 years, examined photos of the engine that was found at the Trade Center site. He stated, “The engine found at the Trade Center was a CFM-56, which is not utilized on a Boeing 767”, confirming that the south tower was not hit by flight 175, but by another plane that had taken its place.
Process of elimination only works if you are aware of everything to eliminate. Passengers remains from flight 175 are not even claimed to have been found and I believe only only DNA from 12. You don't know that flight 175 didn't land or have something else happen to it you are guessing. It's not proof.