On the morning of September 13, two large domestic C919 aircraft took off from Shanghai Pudong Airport and flew to Beijing Capital International Airport for the first time, arriving at 10:51 and 11:24 respectively. The data shows that the registration numbers of the two C919 aircraft are B-001F and B-001J respectively, and the aircraft age is 2.9 years and 0.3 years respectively. They are all large aircraft that have been tested before. This flight from Shanghai to Beijing is also shown as C919 test flight. According to China business news, the two C919 airliners flew to Beijing mainly to prepare for evidence collection. At present, C919 aircraft has completed the certification test flight that lasted for five years. It is waiting for the model certificate to be issued. The certification can be obtained as soon as this month. It is planned to deliver the first aircraft to China Eastern Airlines, the first customer, within this year. IT House learned that C919 aircraft, full name COMAC919, is a large civil jet aircraft developed by China in accordance with international civil aviation regulations and with independent intellectual property rights. It has 158-168 seats and a range of 4075-5555 kilometers. On November 2, 2015, the final assembly was completed, and 815 orders from 28 customers were placed. The performance was equivalent to that of the new generation of mainstream single channel passenger aircraft in the world. It successfully made its first flight on May 5, 2017. On May 14, 2022, the first flight test of the first C919 large aircraft to be delivered to the first user by COMAC was successfully completed. On July 25, six domestic large passenger aircraft C919 test planes successfully completed all test missions. On August 1, COMAC announced that the domestic large aircraft C919 had completed its certification test flight. A few days ago, the C919 domestic large aircraft with registration number of B-001G appeared at Hefei Xinqiao Airport. Such an intensive test flight is expected to be the final preparation for evidence collection and delivery. (Liu Xinshe)