Airlines with planes idled by the pandemic are cutting costs by delaying some maintenance tasks like changing life vests, testing oxygen bottles and checking emergency exits under COVID-19 waivers from airplane manufacturers and regulators. The move allows airlines to stop the clock on a category of parts that would otherwise need checks or pass their "use-by" date without leaving the ground because of the huge number of planes parked during the pandemic. In special guidance to… (www.msn.com) 更多...