Shortly after the crash, another helicopter flew near the slackline, the National Transportation Safety Board investigation ...

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.

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

A recreational tightrope strung across a remote Arizona canyon likely triggered a helicopter crash that killed four Oregonians from the same family. The tragedy has drawn scrutiny of a little-known ...

Federal aviation records show a notice was issued to pilots that a tightrope would be stretched across a mountainous area of Arizona, providing a warning to watch out for the temporary obstacle ...

This article originally published at Helicopter crashes into kilometer-long slackline in Arizona, killing four.

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

The case is making ripples through the aviation world, with safety experts unaware of any other helicopter crashes that have ...

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

A fatal Arizona helicopter crash involving a high-altitude slackline has renewed scrutiny of the FAA’s NOTAM system ahead of ...

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, ...

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