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 people who strung the line - which is used in a sport akin to tightrope walking - had filed an aviation safety notice, raising questions about the air alert system.

The NTSB released on Wednesday its preliminary report into the helicopter’s collision with a slackline, including new ...

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

A preliminary report reveals the helicopter hit a slackline, a type of webbing, that was stretched across Telegraph 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, ...

Federal investigators recovered the helicopter near Superior and continued examining what led to the crash that left 4 family members dead.

Jan. 28 (UPI) --A pair of German daredevils took a walk across a slackline suspended between two hot air balloons and earned a world record for their stroll at an altitude of 8,202 feet. Friedi Kühne ...

A helicopter collided with a slackline over a canyon in Arizona and crashed, leaving four passengers dead over the holiday weekend. Now, a family member has released their identities. The East ...

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 ...