The Swiss news website 20min.ch quoted police spokeswoman Anita Senti as saying that police now know all 20 people on the Junkers Ju-52 propeller plane died in the crash on Saturday near the Alpine resort of Flims.
All 20 people on board were killed, police said Sunday, Aug. 5, 2018.
The plane, which was built in Germany in 1939, crashed into the Piz Segnas mountain around 2,450 metres (8,000ft) above sea level.
There were 11 men and nine women aboard, including an Austrian couple and their son, she said.
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It was the first time the airline had experienced an accident that resulted in death or injury to passengers or crew members, Waldmeier said.
According to JU-AIR, a Ju-52 airplane, which seats 17 passengers along with two pilots, had crashed.
The mountainous area in south-eastern Switzerland is popular with hikers and skiers and includes a glacier.
He said that officials expect the investigation of the cause to be "relatively complex".
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Ju-Air, which offers flights from Junkers Ju-52 planes, said one of its vehicles was involved in the incident.
Initial investigation showed the plane did not lose any parts or break up before it crashed in the Swiss Alps. The heat makes air thinner, increasing the burden on the aircraft. The operator said it was saddened by the news and it had set up a helpline for relatives.
JU-Air runs sightseeing tours on its squadron of German-made vintage aircraft.
A brochure on the company's website listed the cost of the 2-day Locarno trip as 1,130 francs ($1,136), including meals and a night in a hotel.
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It said it was suspending flights until further notice.