The five-seater prototype could face skies crowded with competition, as other startups and giants like Airbus, Boeing or Uber are also tinkering away on their own projects -- with an eye on transforming urban transport.
While it can take off vertically like a helicopter, it also sports wings for horizontal flight, allowing a top speed of 300 kilometres (186 miles) per hour and a range of 300 km.
Both Airbus and Boeing's models have a range of up to 50 miles.
The five-seater jet follows on the heels of the firm's two-seater prototype, which successfully flew in 2017.
Lilium hopes to offer "on-demand air taxi service" in "various cities around the world by 2025", with trials beginning sooner.
Believing they'll encounter "demands for urban air travel that is quiet, safe and environmentally positive," the company will offer an app to let passengers find nearby landing pads for a flight they claim will be "comparable in price with a taxi, yet four times faster".
Air taxi hopefuls will also have to hack through a forest of regulations, safety concerns and public scepticism to build a sustainable business.
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