Here are some great video's that people have made with lots of research on all things related to the attacks on 9/11.
Conclusive Evidence the 9/11 Planes were NOT REAL
This video examines the theory that whatever hit the towers was not a Boeing 757.
06 - What Planes?
This video also examines the theory that whatever hit the towers was not a Boeing 757.
General Albert Stubblebine on 9/11 (improved audio)
07 - The Key
At 15m20s he shows the nose cone that seems to penetrate through the other side of one of the twin towers. But he then shows evidence which suggests that nothing came out of the other side of the tower?
9/11: A False Flag
Retired Expert Pilot John Lear - No Planes Hit the Towers on 9/11
David Long, 9/11 Eyewitness
9/11 War Games
9/11 Trillions: Follow The Money
15 years of deception; 9/11 reviewed
Flight Attendant sheds new light on 9/11.
WTC 7: Firefighters for 9/11 Truth: "Calling OUT Bravo 7"
Sept. 12, 2001 Television - NBC 7-8 a.m.
CBS2 NY , Sept. 11, 2001, 4:11 to 5:16 p.m.
C911 Truth ~ Experts Speak Out
Matt Sullivan 2013 "The Pentagon Flyover Theory"
This video might explain why there are reports of two planes seen at the Pentagon.
Maybe one of the planes flew over the Pentagon and a separate plane hit the Pentagon?