Deliveries of all-new Russian aircraft have been delayed by two years due to safety concerns ... The publication said that, for example, the weight of the new MS-21 passenger aircraft has increased by 5.75 tons, compared to the previous version, which used foreign components and Western engines. This means its flight range and altitude have been significantly reduced. One of Kommersant's sources said that, if Russia is unable to reduce the weight of the aircraft, it will be impossible for authorities to make the plane achieve the desired performance characteristics. "It's impossible to increase engine thrust by 20 percent," the...