One two three airlines is not a low-cost airline. 123 Although it seems to be an independent airline, it was actually established by Eastern Airlines. Therefore, the first, second and third airlines are all subsidiaries of China Eastern Airlines and full-service airlines. The difference between the first, second and third airlines and China Eastern Airlines is that 123 airlines operate domestic aircraft. 123 airlines' business scope includes public air transport business, general air charter flights, medical rescue, commercial pilot license training, aircraft escrow, private pilot license training, aircraft and aviation equipment maintenance, and aviation agency business. At the same time, 123 Airlines is also the first domestic air carrier established by civil aviation central enterprises, mainly operating ARJ2 1 and C9 19.