The tragic demise of President Ebrahim Raisi of Iran in a helicopter crash is a dire reminder of the hazards of travelling in one of aviation's most vulnerable flying machines. To do so in bad weather in a mountainous region in an old US Bell helicopter that may not have had the full benefit of servicing and parts due to US sanctions on Iran since the Iranian Revolution of 1979 was to invite disaster. A constructive trip to northern Iran to inaugurate a dam that would serve both Iran and northern neighbour Azerbaijan proved disastrous for the occupants of just…
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