We've had this discussion before in response to Rob Balsamo's claim that the AA77 FDR indicated a flyover because the plane was "too high". If you hate your brain, do a forum search...but I won't be held accountable for lost brain cells.
The short answer is that the altimeter of an airliner is accurate to about 20 feet at lower altitudes, but there is a large possibility of error when the aircraft is flying outside its normal design envelope and it's also susceptible to pneumatic lag at high rates of descent and high speed. For landing, or more accurately, precision landings, a radar altimeter is used for increased accuracy to about a foot.
The idea that a homing device was placed in the towers is silly. I'd be happy to detail why if anyone is interested...
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Wouldn't they have to have hit the building at somewhere where there weren't charges, so as not to destroy the rigging? Especially since the towers were "demolished" about an hour later?
