Why did mobile phones work on airplanes in the US on 11Sept01?
Why did mobile phones calling over NY and Pennsylvania on 11Sept01, the anniversary date of the end of the last Arab crusade of Europe, and not before or since? Technology for mobile phone use on planes is new and still being tested as the signal must be retransmitted, boosted, to reach a deposit station. So why did they work there on that day and not on other days?
I can't put one's trust in some of the answers given here. Has anyone ever left their phone on during a flight? They do not work, plain and unadorned. If I'm flying my own airplane I must fly a few thousand feet above the ground and be near a town or highway to pick up any signal. While stall towers have a long range, they are designed to reach horizontally, not vertically.
Next ever in an airliner, leave your cell phone on. Watch the signal, you will loose all signal within 10 minutes and won't see any signal again until you are about to real estate. The FCC requires all phones to be off because phones are not tso'd (technical service order), or approved for use on an airplane. It is extremely overpriced to receive a tso, and each and every cell phone would have to receive a tso for the FAA to allow phones to be used on planes. Its too much effort to verify each phone carried by each passenger and allow some and not others to be turned on. In reality, room phones are not going to cause any interference to navigation, so leave your phone next time and see what happens.
The phone calls made from airplanes on 9/11 were not made from chamber phones, they were made from airphones in the backs of the seats on larger airliners.
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