Uber teams up with Hyundai Motor to develop small electric-flying cars

US ride-hailing company Uber Technologies Inc and South Korean automaker Hyundai Motor have teamed up to develop electric air taxis, joining the global race to make small self-flying cars to ease urban congestion.

Global players like Germany's Daimler , China's Geely Automobile and Japan's Toyota have all unveiled investments in startups that aim to deploy electric flying cars capable of vertical takeoff and landing. But there are big technological and regulatory hurdles to the plans.

Uber and Hyundai, for instance, gave widely different timelines for commercialisation, underlining these challenges.