From AircraftOwner Online
You do it at the movie theater, the supermarket, as well as your favorite coffee shop on the way to work: You line up and wait. And, after September 30, 2010, you may also be asked to do it at your local towered airport.
Designed to help simplify and standardize air traffic control (ATC) phraseology, as well as to comply with International Civil Aviation Organization (ICAO) standards, U.S. controllers will use the term “line up and wait” in place of “position and hold” when instructing a pilot to taxi onto a departure runway and wait for takeoff clearance. Both current and future versions of the phrase are used when takeoff clearance cannot immediately be issued, either because of traffic or other reasons.
Why “line up and wait?” The phrase has actually been in use by a majority of ICAO contracting states for many years. It has proven useful with many non-native English speakers who can sometimes confuse “position and hold” with similar-sounding phrases like “position and roll,” “position at hold,” or “hold position.” Misinterpretation of this instruction can have serious consequences. Using “line up and wait” helps avoid ambiguity and keeps the global aviation community accountable to the same standard.
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