The March 2021 helicopter crash in Alaska that killed billionaire Petr Kellner and four others was likely caused by pilot error and inadequate training, a report by the U.S. National Transportation Safety Board (NTSB) said on Wednesday.

Archived version: https://archive.ph/vqW8q
Archived version: https://web.archive.org/web/20230927235039/https://www.reuters.com/world/us/pilot-error-led-alaska-crash-killing-billionaire-petr-kellner-ntsb-says-2023-09-27/