The Chinese-made C919 passenger jet will make its first scheduled international flights next month in a significant milestone for the country’s ambitions to become self-sufficient in aerospace.Planes, operated by national carrier Air China, will start flying between Beijing and the Mongolian capital Ulaanbaatar on August 12, making one flight from each city every day, according to state news agency Xinhua.The plane has already been making regular commercial flights to and from Hong Kong, its...