Ditto.
Just look at the Mirror's story--they cite as one piece of evidence the scrambling of F-16s from the DC area around 9:50 and the Mirror suggests they flew toward Shanksville, then another piece of "evidence" is a sonic boom near Shanksville at 9:20, well before even the Mirror says any F-16s were in the area.
If there was a shootdown after 10 a.m. then the 9:20 "evidence" isn't evidence at all, because it clearly had nothing to do with any military jets. Yet the Mirror is citing this as one of a handful of key pieces of evidence for their theory.
This is a mish-mash of oddities thrown together to create a phony pattern even though the oddities are internally contradictory. As others have noted, an Air Force jet flying 50 feet off the ground would make a bit more noise than what the witness reported, just to name one.
I would have no objection if the Air Force had shot down that plane, but the Mirror's story adds up to very little.