Do you think 9/11 was an inside job?

I saw this girl at school walking around with a roster that said 9/11 was an inside job. I sure hope it wasn’t but there are some pretty suspicious things that happened that day. Like the fact that there were no airplane parts found in the Pentagon and what about the third building that went down next to the towers and nothing actually hit it? There are other things but I’ve just never fully researched them.

What is your opinion on all this? Do any of you believe that 9/11 may have been planned to start a war? Any other insights?