Deadliest plane crashes of all time

Experts say one of the deadliest air disasters in history was averted last week, after air traffic control prevented an Air Canada from landing on a busy taxiway, on which four aircraft were waiting. But what really is the deadliest? Here, we count down the worst plane crashes of all time. It’s worth noting at this point that 2017 is on its way to being one of the safest years in aviation history,