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 recreational tightrope strung across a remote Arizona canyon likely triggered a helicopter crash that killed four ...

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 ...

Slackline warning was issued before helicopter crash that killed groom and nieces on wedding day - The pilot was taking his ...

Four Oregonians died Jan. 2 in a helicopter crash in a remote canyon in Arizona. The Pinal County Sheriff's Office said the aircraft appeared to have struck a slackline stretched across a canyon just ...

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

A half-mile-long slackline was hung across Telegraph Canyon, a recreational area located about 60 miles east of Phoenix in ...

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.

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

A property owner says the slackline the helicopter is believed to have hit didn't have his permission to be there.