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?

The helicopter crashed after it struck a recreational slackline suspended in Telegraph Canyon on Jan. 2, killing all four ...

The National Transportation Safety Board has issued a preliminary report about the Jan. 2 helicopter crash that killed a ...

The National Transportation Safety Board released its preliminary report on the Jan. 2 Superior crash that killed four family members on the pilot's wedding day.

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

An investigation is ongoing after an eyewitness saw the helicopter crash and fall.

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 ...