Megazone
On his last warning
Here's the 911 commission enquiry answer.
http://govinfo.library.unt.edu/911/report/911Report_Notes.htm
Because there was a crash site and black box they were able to identify the terrorists via process of elimination and link them back to Bin Laden. I'd already fairly much answered that.
See also https://en.m.wikipedia.org/wiki/United_Airlines_Flight_93
Read the citations since it's Wiki.
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That's fair enough and logical enough to understand.
Was this the case with the planes which hit the twin towers too?