Getty Images The Boeing 737 Max 9 isplay at Le Bourget on June 22, 2017An Iranian airline under sanctions by the U.S. for ferrying weapons and fighters into Syria repeatedly bought U.S.-made jet engines and parts through Turkish front companies over the past several years, most recently in December, federal investigators said in a new U.S. government filing. The U.S. says in the filing that a Turkish woman set up a series of shell companies to buy needed equipment from U.S. suppliers for Iran’s Mahan Air, helping the airline circumvent the longstanding sanctions and fueling suspicions about Iran within the Trump administration. The revelation could bolster a case by some within the Trump administration against granting Boeing Co. BA, -0.40% licenses to sell Iran scores of new planes, a multibillion-dollar deal inked after Tehran signed the landmark 2015 nuclear agreement. The filing documents purchases from September 2016 through December 2017.via