The C9 19 medium-sized passenger aircraft (COMAC C9 19) is the first trunk civil aircraft developed and assembled by China in cooperation with enterprises from the United States, France and other countries according to the latest international airworthiness standards. Development began in 2008. C is the initials of China and COMAC, the abbreviation of Comac. The meaning of the first "9" is eternal, and "19" represents the maximum passenger capacity of China's first medium-sized passenger plane 190. The C9 19 medium-sized passenger plane is a landmark project to build an innovative country, and its body has completely independent intellectual property rights.

C9 19 large passenger plane has basic mixed-class layout 158 seats, economy class layout 168 seats and high-density layout 174 seats. The design range of the standard range type is 2200 nautical miles (4075 kilometers), and the design range of the extended range type is 3000 nautical miles (5555 kilometers). The maximum flying altitude is 39,800 feet (12 13 1 m) and the cruising altitude is 35,000 feet (10668 m).

C9 19 large passenger plane adopts swept single wing, high aspect ratio, supercritical airfoil and common tail. Two Gao Han Dobby turbofan engines with wings suspended. The first three retractable landing gears. The total length is 38.90 meters, the wingspan is 35.80 meters, the overall height is 1 1.95 meters, the main tread is 7.62 meters, and the front main tread is 13.47 meters.

The extremely modern and smooth appearance of domestic large passenger plane C9 19, coupled with the industry-leading energy efficiency performance, will make it among the most competitive aircraft in the world aviation field, and it is very likely to break the market pattern of trunk jet aircraft monopolized by the two giants. In the future, citizens can choose "C" in addition to "A" and "B" when flying in civil aviation.