Questions about 9/11 that you still dont have answers to

Re: Questions about 9/11 that you still dont have answers to

I think its because they had about 5 hijackers in every flight and then minimum 2 were able to enter cockpit. Once 2-3 people are in cockpit with sharp box cutters, dont you think its easy for them to take over the plane?

Plus only 3 were successful, 4th hijacking was not.

My question always remained the same about Pentagon Hijacking.

Where is the plane?