http://www.hydrogenfuelnews.com/hydrogen-powered-aircrafts-could-be-in-the-skies-by-as-early-as-2030/8537773/

By 2030, over 20,000 VTOL flying taxis are predicted to be in operation worldwide.
Hydrogen-powered aircrafts may only be a decade away from becoming reality. According to predictions from a Hydrogen Council Report 2018: “Hydrogen meets digital,” it is estimated that by 2030, of the more than 20,000 vertical take-off and landing taxis predicted to be flying globally, as many as 8,000 of these VTOLs could be powered by hydrogen.

Hydrogen could deliver a better power system to these vehicles compared to batteries.
Today, there are already prototypes of electric flying taxis, such as Uber’s Uber Elevate, which the company hopes to launch in 2023.

However, in the long run, cH2ange – an initiative by Air Liquide – has said in a video, recently posted on its Twitter, that compared to electric batteries, hydrogen can help to lower the vehicle weight, carry more passengers and cover distances two to three times longer, without having to recharge.

The initiative goes on to say in its video that “with hydrogen, autonomous flying taxis will become a reliable, efficient and zero-emission mobility solution.”