Air Canada 759 Near Miss Taxiway Overflight San Francisco
Air Canada 759 narrowly avoids landing on a taxiway occupied by four aircraft at San Francisco.
Summary
An Air Canada Airbus A320 mistook Taxiway Charlie for Runway 28 Right during a night approach at San Francisco International Airport. The aircraft descended to within 60 feet of the ground, flying directly over four fully loaded planes waiting for takeoff before initiating a last-second go-around. This event is widely considered one of the closest calls in modern aviation history.
Analysis
On the night of July 7, 2017, Air Canada flight 759 was cleared for the "Bridge Visual" approach to Runway 28 Right at SFO. Due to Runway 28 Left being closed for construction and its lights being deactivated, the flight crew suffered a visual illusion. They mistook the lights of Runway 28 Right for 28 Left, and consequently mistook the lights of Taxiway Charlie—where four aircraft were queued for departure—for their assigned landing runway.
The recording captures the chilling moment the Air Canada pilot asks for confirmation of their clearance because they see "lights on the runway." The controller, unaware of the misalignment, reassures them they are cleared. It is the pilot of United Flight 1, sitting first in line on the taxiway, who breaks radio silence to ask, "Where’s this guy going? He’s on the taxiway." This alert, combined with the controller's immediate "go around" command, prevented a catastrophic collision.
Aviation experts note that AC759 flew so low that it passed just feet above the tail of a Philippine Airlines Airbus A340 and a United Boeing 787. The NTSB investigation later determined that the Air Canada crew had been awake for over 18 hours, citing fatigue and the complexity of the visual environment as primary factors.
The aftermath of this incident led to significant changes in San Francisco's arrival procedures. New requirements were implemented for using the Instrument Landing System (ILS) during night approaches, even in clear weather, and the airport modified its lighting configurations to more clearly distinguish between runways and taxiways when a parallel runway is closed.
Technically, the "Bridge Visual" is a common approach into SFO that relies on pilots identifying the San Mateo-Hayward Bridge. While routine, the lack of a glideslope or localizer guidance in a purely visual approach leaves a higher margin for human error, especially when the expected geometry of the airport lights is altered by construction.