ZeroAvia's six-seater plane, which is named the Piper M-class, only emits water vapour into the atmosphere.
And the firm is hoping that by 2023 they will be able to run commercial flights.
ZeroAvia founder and chief executive, Val Miftakhov, told Sky News: "What we're doing is replacing fossil fuel engines with what's called hydrogen electric engines.
"We also have a fuelling infrastructure set up that ensures zero emission production of hydrogen itself."
zero-emissions flight by the end of this decade.
The UK government has given the firm its backing through the Jet Zero Council initiative, which hopes to make zero-emissions flights a reality in the future.
On Thursday (24.09.20), the aircraft flew over Bedfordshire, England.
And ZeroAviva is next planning a 250-mile flight out of Orkney, off the northeastern coast of Scotland.