Musk plans to fast-track Tesla's autonomous driving technology in China amid declining shares and rising competition, reports say.

Tesla CEO Elon Musk was on a flight to Beijing on Sunday to begin a surprise tour in the electric car maker's second-largest market, according to reports, citing two individuals familiar with the situation.

A private jet linked to Tesla CEO Elon Musk landed in Beijing on Sunday, a flight tracking app showed, as two people with knowledge of the matter said the billionaire was kicking off a surprise visit to the automaker's second-biggest market.