[eno_]

No, I doubt that's the kind of thing that you could conceal just by destroying the tapes. If the flight controllers had reason to believe Flight 93 was shot down, they would've already said as much a long time ago. Air traffic controllers see a lot they should not talk about, and, generally, they don't.

[AntiGuv]

Yes, but even what they don't talk about generally gets whispered about, especially when it involves something of such magnitude..

[diogenes ghost]

Flight 93 was nowhere near these controllers airspace when it went down, not even in same facilities airspace.