European planemaker Airbus SE unveiled three designs it’s studying to build hydrogen-powered aircraft as it races to bring a zero-carbon passenger plane into service by 2035. The approaches include a turbofan jet with capacity for as many as 200 passengers — similar to its A321neo narrow-body — that can fly more than 2,000 nautical miles, according to a statement Monday. It would be powered by a modified gas-turbine engine running on hydrogen.

Hydrogen is becoming an increasing area of focus for Airbus as it evaluates technologies for emission-free flight. The company is under pressure from the French and German governments, its biggest shareholders, to speed development of new aircraft after aiding the planemaker during the coronavirus crisis. Together, the two countries have committed some 2.5 billion euros ($2.9 billion) toward cleaner propulsion.

While there are different approaches, hydrogen is likely to be used in aerospace and other industries to meet climate-neutral targets, Airbus said. The company has already said it’s targeting the mid-2030s for the first zero-emission passenger jet. Developing a hydrogen aircraft on that timeline will be a real challenge because of the massive amounts of infrastructure and government investment required.