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?

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.

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, ...

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 ...