How was a thin strip of nylon or polyester webbing stretched between two points to blame in the January crash that killed four near Superior?

Investigators say a helicopter hit a highline stretched across Telegraph Canyon near Superior, killing four. Here’s what to know.

Preliminary evidence indicated a slackline of more than 1 kilometer in length was strung recreationally across a canyon.

Federal investigators are examining if a slackline was properly authorized following the deadly helicopter crash near Superior that claimed the lives of four people on Friday, ...

A sightseeing helicopter carrying four family members crashed in the mountains of central Arizona after apparently striking a slackline stretched high across a canyon, killing everyone on board. The ...

Add Yahoo as a preferred source to see more of our stories on Google. A fatal helicopter crash southeast of Phoenix involved a slackline, also known as a highline, which investigators say the aircraft ...