James G
Gone Fishin'
All this Flight 93 talk disregards the F-16s scrambled out of Andrews AFB and Toledo, OH rushing to down the airliner before it reached DC, not to mention whatever air defenses were covering the Mall area. The chances of the airliner making a controlled crash are very slim.
https://www.washingtonpost.com/loca...4d231dfde50_story.html?utm_term=.083f530c3d20
http://www.toledoblade.com/local/2011/09/02/Local-F-16-pilot-reflects-on-role-chaos-of-9-11.html
Were the F-16s armed? IIRC the earlier F-15s, which went out to sea, had only shells for their cannons. So much for national air defence missions! Plus, as I say above, where and how you hit a massive target like a full-loaded aircraft is really important because that aircraft is coming down somewhere, even when hit it can be crashed purposely somewhere.