On 9 December 2022, COMAC delivered the “C919 World’s First Commemorative Key” to China Eastern Airlines and issued a sales certificate for the aircraft; the Civil Aviation Administration of China (CAAC) issued a nationality registration certificate, a single aircraft airworthiness certificate (AC certificate) and a radio license to China Eastern Airlines. This marks the official delivery of the C919 to China Eastern Airlines Co.
This morning it has actually completed a manned flight from PVG-SHA, although this is not really a commercial operation. According to the Civil Aviation Administration of China (CAAC), the C919 is required to undergo 100 hours of commercial operation testing after delivery to China Eastern Airlines. Officials say that official commercial operations are expected to begin in spring 2023
Well, I need to remind you that designing a modern aircraft is not a matter of simply piecing it together. Every aircraft has some reference, however this is a different concept to putting something together.