PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Radar screen in the Air Traffic Control Tower of San Francisco International Airport. The green radar displays show aircraft flying within 50 nautical miles of the airport, captured by the Primary Surveillance Radar (PSR). Controllers at the top of the tower deal only with aircraft within San Francisco's Terminal Manouvering Area (TMA): aircraft overflying the area and those up to 250 nautical miles away are dealt with by regional controllers elsewhere in the tower.
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