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Well obviously I cannot attest to the situation, I have been able to use my cel phone while waiting for clearance to land at MCO airport. I am assuming that the average flight altitude while waiting for clearance is well above 300 feet. I have been told that SOME and I do say SOME airlines have an on-plane transponder for cel phone usage, although I have not been able to find anything in print to support this, and seriously doubt that Flight 93 had one. perhaps my flight did? I don't know for sure. But even so, as the math has shown, it is very possible for someone to have a good connection at up to 20,000 feet of altitude, even with the TDMA phones commonly in use at that time.
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"It is not that I have failed, but that I have found 10,000 ways that it DOESN'T work!" --Thomas Edison
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