Watch: Air Canada Flight Nearly Hits Four Planes at SFO in Newly-Released Security Video

Correction | A previous version of this story referred to Air Canada Flight 781 missing go-around instructions in October.

Update | The National Transportation Safety Board released security footage of Air Canada Flight 759's near-miss of several planes while landing at San Francisco International Airport last July.

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All four planes were fully loaded and at least one of those pilots had reported the odd flight path coming in their direction. But there was no response from the Air Canada cockpit. Screenshot: NTSB Security Video

The Air Canada pilot managed to fly over the first two of four planes by less than 100 feet. The July incident, which experts said would likely have been one of the worst aviation disasters of all time, was just one of several close-calls at SFO in the past 16 months that the Federal Aviation Administration has mainly blamed on pilot errors.

Ian Gregor, the FAA's Pacific Division communications manager, issued a statement to Newsweek in which pilot error was blamed. "The FAA's investigation, which included interviews with the flight crew, revealed the crew inadvertently switched from the SFO tower frequency to the SFO ground frequency after receiving their landing clearance," the statement read. "The FAA deemed this event to be an isolated occurrence and not reflective of any systematic deficiencies at Air Canada."

"This could have been the worst aviation disaster in history," United Airlines Captain Ross Aimer, CEO of Aero Consulting Experts, told Global News in July. "Imagine an Airbus cartwheeling over four other aircraft full of fuel and passengers. We are talking over 1,500 casualties and five aircraft in flames."

The Air Canada pilot told the NTSB he aborted the SFO landing on that taxiway before he heard anything from the control tower because "things were not adding up." Captain Dimitrios Kisses said he opted to go around because the airport was fairly dark and the runway "did not look good" on approach, according to the NTSB investigation documents released Wednesday. Both Kisses and his co-pilot reported being tired.

The near-miss incident was not reported to FAA or airport officials until two days later. The dark surveillance footage shows the near-miss in the back left of the video screen.

"Upon landing the crew was informed the tower had attempted unsuccessfully to contact the aircraft, however, the message was not received by the crew. Air Canada is investigating the circumstances," Air Canada said in a statement issued at the of the incident.

Several lights had been added and a particularly confusing SFO taxiway was closed in December 2016. Many pilots have said that the international airport is notoriously difficult to navigate. The FAA's statement to Newsweek said San Francisco International Airport modified its ground radar system to "identify potential conflicts when aircraft are 3/4-mile from the airport. Previously the system identified potential conflicts when aircraft were 1/2-mile from the airport."

In July 2013, three people died and 187 individuals were injured at SFO when Asiana Airlines Flight 214's tail section broke off after it struck a seawall on the edge of the runway. The Boeing 777 was carrying 307 people and one of the deaths was a 16-year-old Chinese girl who was run over by a fire truck racing to the scene.

This story has been updated with comments from the FAA's Pacific Division Public Affairs Manager Ian Gregor.