More details on botched Air Canada landing

A preliminary report released by Canadian air safety regulators shows an Air Canada flight travelled almost half a kilometre over a taxiway at San Francisco International Airport, and came within 30 metres of crashing onto two of four planes.
Authorities say the July 7th incident could have been one of the worst disasters in commercial aviation history.
The pilot of the Air Canada flight carrying 140 people mistakenly lined up with the parallel taxiway instead of the runway, before pulling up sharply, circling, and landing safely.