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Arizona helicopter crash kills 4 after hitting slackline in canyon
Preliminary evidence indicated a slackline of more than 1 kilometer in length was strung recreationally across a canyon.
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usatoday.com
Arizona helicopter crash kills 4 after hitting slackline in canyon
Preliminary evidence indicated a slackline of more than 1 kilometer in length was strung recreationally across a canyon.
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bbc.com
Helicopter appears to crash into slackline in Arizona, killing all passengers
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.