Some of ICBC Financial Leasing's global clients have also expressed an interest in C919s, he said.

Eric Chen, president of Airbus China, said the global civil aviation market has enough capacity for another player.

COMAC expects that 6,218 new aircraft will be delivered to China in the next two decades, and 4,195 of them will be single-aisle jets, such as the C919 and Airbus A320.

China's fleet will grow to 7,034 by 2034, driven by stable economic growth and improvement in consumption over the next two decades, COMAC said.

COMAC's outlook is slightly lower than Boeing's, which estimates China's fleet to triple to 7,210 in the next two decades.

Yang Yang, director of the marketing research center at COMAC, said that though the market outlooks are different, COMAC still has an edge over others.

"We understand more about the China market, as we are a Chinese manufacturer," he said.