Home Air Taxi, UAM/AAM Hydrogen vs Batteries: Urban Aeronautics’ founder says it’s hydrogen for UAM Hydrogen vs Batteries: Urban Aeronautics’ founder says it’s hydrogen for UAM [Sifted] 29 Jun 2020 | Air Taxi, UAM/AAMHeadline5Hydrogen Hydrogen is the only way to make flying cars viable says Urban Aeronautics founder | Sifted A nippy flying car small enough to land on any urban street will need to be powered by hydrogen rather than batteries. This is why.