At a somewhat small and unassuming airport in Maribor, Slovenia, German hydrogen propulsion startup H2FLY has quietly been building up to a major milestone in zero-emission aviation over the summer. And all the hard work has come to fruitio
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Hydrogen-powered planes are, essentially, nothing new. The USSR flew the alternative fuel testbed Tupolev Tu-155 on hydrogen (and liquid natural gas) more than 35 years ago.
However, challenges associated with the technology meant that it