Aerospace engine makers work with European regulators after delays in US rules

Aerospace companies are pushing U.S. regulators to simplify domestic rulemaking, after delays led the country's aircraft engine makers to a European agency to meet a global emissions standard on time, executives and regulators said. Raytheon Technologies Corp's Pratt & Whitney and General Electric went to Europe's aviation regulator to comply with the United Nation standard on non-volatile particulate matter (nvPM), set to curb soot particles. The workaround with Europe did not delay jet engine deliveries, but did add costs and work to already taxed suppliers as travel has rebounded, a senior industry source familiar with the matter told Reuters. The source, who asked not to be identified, could not specify the costs. Separately, European planemaker Airbus is tempering the pace of planned production increases due in part to supply chain stress.<br/>