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

The people who strung the line - which is used in a sport akin to tightrope walking - had filed an aviation safety notice, ...

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

The line was more than 1 kilometer long, or more than half a mile, strung between mountains near Superior, Arizona, ...

A helicopter pilot is warning about the dangers of flying in canyons after a deadly crash near Picketpost Mountain that killed all four people on board.

Four Oregon family members were identified Sunday as those killed when the private helicopter they were in hit a slackline ...