Inside a hangar on the outskirts of Gothenburg, Sweden, lies the sleek metal frame of an electric plane poised to change the way we fly forever. The hangar belongs to Heart Aerospace. The Swedish startup is building a hybrid-electric 30-passenger airliner called the ES-30. It could offer a cleaner, cheaper alternative to short-haul flights on routes across the world. Unlike other battery-powered planes — like flying cars or air taxis — the ES-30 looks, for lack of a better word, pretty normal. “A lot of companies obsess over how an electric aircraft will look.