Larry Page, CEO and Co-founder of Alphabet, is backing two start-ups that are working on flying cars, Bloomberg said on Thursday, citing sources. Zee.Aero, into which Page has poured more than $100 million since it started in 2010, conducts test flights of its prototype at an airport hangar in Hollister, California, Bloomberg said.

The start-up has a manufacturing facility on NASA's research center at the edge of Mountain View, the news agency said.

Since last year, Page has also been funding another start-up, Kitty Hawk, that is working on a similar competing model, Bloomberg added.

Kitty Hawk is working on "something that resembles a giant version of a quadcopter drone", according to Bloomberg.