Embraer shifts possible development of fuel-cell aircraft back five years

Developing novel propulsion technologies has proven more challenging than expected, leaving Embraer's chief engineer now predicting his team would need until 2040 to bring a hydrogen-fuel-cell-powered aircraft to market.

https://www.flightglobal.com/airframers/embraer-shifts-possible-development-of-fuel-cell-aircraft-back-five-years/160810.article