I agree. The Pentagon seems like a dead end. Jon's assessment is bang on, to which I would add the following: As soon as someone says Flight 77 didn't hit the Pentagon, the next question is usually, "Then where are the passengers?" End of conversation. Speculate until the cows come home.

Also, the fact that almost every msm take on 9/11 Truth begins with the "no plane at the Pentagon" material suggests that our opponents feel it is an argumentative slam dunk.