Because information collected after the terrorist attacks of September 11, 2001 has raised questions about the alleged ability and motivation of the people accused of piloting Boeing 757 and 767 planes into the World Trade Center, the Pentagon and a field in Shanksville, Pennsylvania, speculation has since lingered regarding the covert use of technology to precisely self-navigate all 4 airliners into targets that day.
Government and aviation industry publications shed light on the development and implementation of pre-9/11 state-of-the-art systems capable of facilitating precise automated navigation of the Boeing 757 and 767 aircraft used during the 9/11 attacks, to a given destination.
"WAAS (Wide Area Augmentation System) is an extremely accurate navigation system developed for civil aviation. Before WAAS, the U.S. National Airspace System (NAS) did not have the potential to provide horizontal and vertical navigation for approach operations for all users at all locations. With WAAS, this capability is a reality ... WAAS provides service for all classes of aircraft in all phases of flight - including en route navigation"