Chinese state-owned planemaker COMAC upstaged industry leaders Airbus and Boeing at the Singapore Airshow this week, showing off its self-developed C919 and ARJ21 jets as it pursues international certifications and foreign orders. "A reliable new choice," proclaimed an advertisement on COMAC's large booth in the centre of the show's event hall. The C919, a rival to the Boeing 737 MAX and Airbus A320neo family single-aisle jets, flew for the first time outside Chinese territory.