On April 23, China's homegrown large passenger aircraft C919 has successfully undergone its fourth high-speed taxi test at Shanghai Pudong Airport. The research and development of China's large aircraft (which are in fact medium-sized aircraft) must be airworthy to the Federal Aviation Administration (FAA) and the European Aviation Safety Agency (EASA). At present, some Chinese governmental departments and public opinions believe that, regardless whether the C919 can obtain the FAA airworthiness certificate, it would not be a huge impact for the C919 research and commercial operation in the future. However, Anbound's follow-up study shows that there is a big problem with this understanding and it is worthy of careful consideration. After C919’s test flight, the next step for China is to focus on solving its FAA and EASA airworthiness. Despite the great difficulties and challenges, if China wants its aircrafts to join the world market, C919 must get FAA and EASA airworthiness certificate.