Federal investigators confirmed that an Air Canada jet was descending toward a taxiway holding four other planes rather than the assigned runway at San Francisco International Airport.

Investigators looking into the frighteningly close call involving an airliner that nearly hit planes on the ground at San Francisco International Airport will try to determine why the pilots made such a rookie mistake.

There were four planes loaded with fuel and passengers on the taxiway. They were waiting to take off as the Air Canada jet approached.