Congestion in the skies and on the ground may pave the way for bullet train expansion to Phoenix and other western cities.
Regional rail planners from Denver, Phoenix, Las Vegas, Reno and Salt Lake City have formed the Western High Speed Rail Alliance.
The group says it's goal is to form a network of rapid intercity trains.
Transportation officials plan to cite a study released by the Washington think tank the Brookings Institution. It's expected to show Phoenix to Los Angeles is the third-busiest short-hop air travel corridor, with a distance that would make high-speed rail competitive.
Although it's years away, transportation experts say a typical high-speed train, common in Europe and Asia and costing billions, would get passengers from downtown Phoenix to Los Angeles in just over two hours.