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Why was it changed from "Position and Hold" to "Line Up and Wait"?
In July 2000, the National Transportation Board (NTSB) recommended that FAA phraseology be amended to require the use of standard ICAO phraseology for airport surface operations to further reduce the risk of runway incursions. In addition, the Air Traffic Procedures Advisory Committee requested FAA revise U.S. policy to require the use of the ICAO phrase, “line up and wait”, rather than “position and hold.”The FAA conducted a safety risk analysis and determined that the use of the words, “position and hold,” are found in a number of air traffic surface instructions, which potentially misleads pilots when only partial communications are heard. Adoption of the “Line up and Wait” phraseology provides a unique instruction for pilots to position their aircraft onto a runway from a holding position.
And here's an animation for the use of the new phraseology:http://www.faa.gov/airports/runway_safety/news/current_events/lauw/media/LUAWv3Webversion.swf