Two 14-year-old boys and their adult pilot died in a plane crash after the man let one of the teens take the controls.
A 17-year-old girl was seriously hurt when the Piper PA-28 came down in southeastern Switzerland in 2017.
The Swiss Transportation Safety Investigation Board said in a report Friday the pilot had chosen a risky flight course.
It added that he hadn’t trained as a flight instructor.
The crash happened around 10 minutes after takeoff. The teens were taking part in a flying club’s annual camp
The report said the club didn’t intend passengers to take the controls.