The US the Federal Aviation Administration as well as the US National Transportation Safety Board is investigating a recent incident at San Francisco airport involving an Air Canada aircraft that appeared to attempt a landing on a taxiway.
Air Canada flight AC759, from Toronto and carrying 135 passengers as well as five crew, was cleared to land on runway 28R on July 7, but the pilot "inadvertently" lined up to land on taxiway C that runs parallel to the runway.
According to the FAA, there were four other aircraft on the taxiway at the time of the incident.
A major mishap was averted when the pilot of an aircraft waiting to takeoff from the same runway alerted air traffic control of the approach of Air Canada A320.
Controllers immediately ordered the A320's pilots to go around, and the aircraft later landed safety. The A320 is said to have gone close to at least one aircraft on the taxiway.
San Francisco International has runways that are closer together than most other airports. Air Canada is yet to comment on the incident.