Google co-founder Larry Page has added flying cars to his list of next-generation technologies that he supports, along with self-driving cars.

Page is investing in two startups that are working on flying cars. He’s funded one of them, Zee.Aero, more than $100 million since it started in 2010, Bloomberg Businessweek reported on Thursday.

Zee.Aero conducts test flights of its prototype at an airport hangar in Hollister, Calif., Bloomberg said. The startup firm also has a manufacturing facility on NASA’s research center at the edge of Mountain View, Calif.

Since last year, Page has also been backing another startup, Kitty Hawk, which is working on a similar competing flying car. Kitty Hawk employs about a dozen engineers and has its headquarters about half a mile away from Zee.Aero, Kitty Hawk is working on “something that resembles a giant version of a quadcopter drone,” the report said.

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Zee.Aero employees refer to Page as the guy upstairs (‘GUS’) by Zee.Aero employees, Bloomberg said. Page had demanded his involvement in the startup should stay hidden, according to the report.

Page, CEO of Google’s parent company, Alphabet Inc., continues to support development of self-driving cars, with prototypes routinely seen driving around Mountain View. Google and Fiat Chrysler Automotive recently announced  deal to produce 100 self-driving hybrid Pacifica prototypes.

Automotive News