A Comac C919 aircraft. Photographer: Qilai Shen/Bloomberg China formally certified its homegrown aircraft to take on Boeing Co. and Airbus SE in the highly lucrative market for narrowbody jets, according to the official Xinhua News Agency. The announcement of the certification of Commercial Aircraft Corp of China Ltd. ’s C919 was made in Beijing Friday, with President Xi Jinping and other high ranking Chinese government officials attending the event, Xinhua said. The report came a day after photos emerged on social media of a ceremony that suggested the jet had been certified.