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Accident investigators and rescue personnel gather around the wreckage of a Junkers JU52 aircraft at Flims on August 5, 2018, after the aeroplane crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Accident investigators and rescue personnel gather around the wreckage of a Junkers JU52 aircraft at Flims on August 5, 2018, after the aeroplane crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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Accident investigators and rescue personnel gather around the wreckage of a Junkers JU52 aircraft at Flims on August 5, 2018, after the aeroplane crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Accident investigators and rescue personnel gather around the wreckage of a Junkers JU52 aircraft at Flims on August 5, 2018, after the aeroplane crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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A biker takes a break on August 5, 2018, in the mountains area where a Junkers JU52 aircraft crashed the day before above Flims, seen in the background. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

A biker takes a break on August 5, 2018, in the mountains area where a Junkers JU52 aircraft crashed the day before above Flims, seen in the background. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)