Last February, a controller at San Francisco International Airport mistakenly cleared an Embraer 175 to land on Runway 28L while an Airbus A320 was waiting to depart at the end of the same runway. A surface surveillance system safety net caught the error and alerted the controller, who commanded the E175 to go around. A catastrophe was averted, but barely: The two aircraft had come within less than 100 ft. of colliding.  The incident became one of four “Category A” runway ...


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