I believe it was Al-Qaeda that trained the pilots. That was Bin Laden's terror group. They did hit the Pentagon, but yes, very brave Americans were able to bring the 4th plane down in Shanksville Pa. before it hit its next target.
I agree with everything you said about the Taliban wasting no time in getting the disabled equipment up and running. I had no doubt this would happen immediately.
Therefore, I reiterate what I posted earlier. There are no women and children at the airport any longer, neither are there innocent Afghanis and those who aided the US there. If they are alive, they are in hiding.
So I still maintain that we should use drones to wipe that airport off the face of the earth and take down any Taliban, Al-Qaeda, ISIS and any other terrorists who are there.
It would be costly but not as costly as what is going to happen to Western nations once the terror groups have reconstituted.
Our government can erase all printed evidence of the weaponry left behind, as
@shotgun09 pointed out, but the Taliban and cohorts don't need to read about it. It's all right there and they're cavorting around in pictures that will inspire terrorism worldwide.