![](https://flightsafety.org/wp-content/uploads/2017/06/SafetyCulture_jun17_featured.jpg)
An Alaska air tour operator’s safety culture — which “tacitly endorsed flying in hazardous weather” — was partly to blame for the 2015 crash of a de Havilland DHC-3 Otter into a tree-covered mountainside in clouds and mist, the U.S. National Transportation Safety Board (NTSB) says.