China's drive to break into foreign aviation markets with its homegrown COMAC jets has intensified, with a push to persuade Vietnam to authorise its planes in the country, according to two people with knowledge of the talks and documents.

China’s homegrown Comac C919 narrow-body passenger jet made its first commercial flight from Shanghai to Beijing, in a symbolic challenge to the decades-old duopoly of Boeing and Airbus in one of the most important markets for aviation.