9/11 Studies Find Aircraft Positioning Mechanism Working on 9/11

Enhanced GPS service (WAAS) now in use by the U.S. commercial aviation industry and activated 13 months prior to the terrorist attacks of September 11, 2001, provided virtual aerial navigation corridors only 243 wide and a 95% confidence that an aircraft's true position will fall within such a corridor . Such corridors can be navigated entirely by autopilot and flight management systems scheduled in 1996 and 1998 to be contained by United and American airlines Boeing 757 and 767 aircraft like those used during the terrorist attacks of September 11, 2001

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