https://www.theguardian.com/technology/2018/jul/10/flying-cars-taxis-pentagon-us-military-funds-joby-kitty-hawk

Exclusive: Self-flying vehicle firms got $2m last year, as military envisions taxis as more Blade Runner than Back to the Future

Two start-ups leading the race to build the first self-flying taxis are using money from the US military.