Slackliners took the line down because of forecasted rain and high winds, but strung it up again the day of the accident.

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.

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?

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

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

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

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

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.

The National Transportation Safety Board has released new details about a helicopter crash that killed four people in Arizona ...

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 ...

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