Air Canada flight AC759 from Toronto to San Francisco had to do a go-around when landing at SFO as it had confused the runway with a taxiway which was filled with planes. If the Airbus A320 hadn't gone around, it would have been the biggest disaster in aviation history. The A320 took off from Toronto at 21:58 and climbed towards 36,000 ft. At 23:25, the pilots started descending and aligned with runway 28R. But, the pilot got confused with the taxiway beside the runway, and aligned with the taxiway. ATC only realised that the plane was about to land on the taxiway when it was only 30 metres from the taxiway. SFO tower commanded the Air Canada plane to go around, and the pilots started rising up again. The pilots successfully landed the plane the second time with no incident. If the pilots would have landed on top of the planes, hundreds of people would have died. Luckily, ATC realised and the crash was avoided.