Safety investigators have concluded that pilot error led to the accident involving the vintage aircraft that killed 20 people in eastern Switzerland in 2018. It was the country’s worst air tragedy since 2001. The Swiss Transportation Safety Investigation Board’s final report, published on Thursday, found that the pilots steered the aircraft, which had been travelling at low altitude, without an alternative flight path and at dangerously low speed into a narrow valley southwest of Piz Segnas in Canton Graubunden. The aircraft approached some turbulence - a phenomenon that can be expected when flying in the mountains. In a statement, the safety board wrote that “the high-risk manner of flying through these not unusual turbulences caused the pilots to lose control of the aircraft”. The plane was flying too low to rectify the situation and ultimately crashed almost vertically into the ground. Everyone on board lost their lives - 17 passengers, two pilots, and a flight attendant. All...