Switzerland's civil aviation authority says it will question a hang-glider pilot after a tourist he flew over a picturesque Swiss landscape nearly fell dozens of metres to the ground because his harness wasn't properly attached.
A nail-biting video of the incident drew more than 1.4 million views on YouTube.
The video zooms in on the two men, noting that the passenger's harness isn't attached. After takeoff, the passenger dangles to the pilot's left, clinging to the glider's bar or the pilot himself.
The passenger finally ejects right before the glider lands in a grassy field.
Spokesperson Antonello Laveglia of the Federal Office of Civil Aviation said it planned to "reconstruct the events" of the flight and would hear the pilot's account.