(REUTERS)  Four people died and two were missing after a helicopter crashed en route to a Chevron oil platform off the Angolan coast, the U.S. oil company said on Tuesday. The helicopter left Malongo port in Angola’s Cabinda province on Monday at 1523 local time to make the short journey to the Tombua-Landana offshore oil platform but never arrived. “The helicopter did not reach its intended destination. It was carrying five passengers and one pilot,” […]