European plane makers Airbus have set an arrival date for hydrogen-powered planes, promising a clean plane engine by the middle of the decade.
The partnership with engine makers CFM International promises to deliver an engine with zero-emissions by 2035. Tests are due to get off the ground within the next three years.
Running off hydrogen, the only exhaust fumes would be water vapour.
The first test engine will be mounted on an Airbus A380, in addition to its four turbofans in a test to measure the performance of the hydrogen powered planes.
It's an experiment that Airbus and CFM want to see done by the middle of the decade.
Airbus chief technology officer Sabine Klauke calls it the most significant step the company has taken since announcing the first concepts in 2020.