Honolulu Rail Transit will become the first large-scale publicly run metro system in the United States to feature platform screen doors, when it opens in 2023. All 21 stations will feature platform gates manufactured by Stanley Access Technologies. New York City's Metropolitan Transportation Authority has not committed to installing platform screen doors in its subway system, though it had been considering such an idea since the 1980s. Their installation presents substantial technical challenges, in part because of different placements of doors on New York City Subway rolling stock. Additionally, the majority of the system cannot accommodate platform doors regardless of door locations, due to factors such as narrow platforms and structurally insufficient platform slabs (see ). Following a series of incidents during one week in November 2016, in which three people were injured or killed after being pushed into tracks, the MTA started to consider installing platform edge doors for the 42nd Street Shuttle. In October 2017, the MTA formally announced that platform screen doors would be installed at the Third Avenue station on the as part of a pilot program, but the pilot was later postponed. Following several pushing incidents, the MTA announced a PSD pilot program at three stations in February 2022: the platform at Times Square; the platform at Sutphin Boulevard–Archer Avenue–JFK Airport; and the Third Avenue station. People movers, systems that ferry passengers across large distances they would otherwise walk, make use of platform screen doors. These systems are common at airports such as Hartsfield–Jackson Atlanta International Airport and Denver International Airport. The Port Authority of New York and New Jersey uses full height platform screen doors at two of its systems: AirTrain JFK and AirTrain Newark (serving John F. Kennedy International Airport and Newark Liberty International Airport respectively). San Francisco International Airport has AirTrain, a 6-mile-long line whose stations are fully enclosed with platform screen doors, allowing access to the fully automated people mover. Chicago O'Hare International Airport has a people mover system which operates 24 hours a day and is a 2.5 mile long (4 km) line that operates between the four terminals at the airport and parking areas; each station is fully enclosed with platform screen doors allowing access to the fully automated people mover trains. AeroTrain is a people mover system at Washington Dulles International Airport in Dulles, Virginia with fully enclosed tracks including platform screen doors. The United States Capitol subway