After analysing statements issued by companies actively developing electric vertical take-off and landing (eVTOL) aircraft, Revolution Aero, which monitors the sector and organises an international conference for it (currently under way in San Francisco in the US), has reported that eVTOL companies have so far racked up more than 4 600 orders for their machines. eVTOL aircraft are electric- or hybrid-electric-powered small unconventional aircraft designs for use in what is now called the urban air mobility market, or, more colloquially, as flying taxis, flying handfuls of people within a city and not usually between cities. “The global eVTOL market is estimated to be worth around $8.5-billion by 2025, and this is expected to grow to $30.8-billion by 2030,” highlighted Revolution Aero co-founder Alasdair Whyte. By definition, eVTOLs are low-carbon (hybrid) or zero-carbon (all-electric) emitting systems.