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 ...

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

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.