While flying cars may seem like a futuristic fantasy from science-fiction movies, a startup in Japan is aiming to offer people rides in such vehicles in about four years' time at the World Exposition in Osaka.

SkyDrive Inc., a developer of flying cars founded only three years ago, demonstrated the country's first public test flight of a manned vehicle in August last year, and hopes to introduce such mobility as an option that has advantages over existing modes of transport.

"Our mission is to drive a once-in-a-century mobility revolution," CEO Tomohiro Fukuzawa said last month during a news conference at the Foreign Correspondents' Club of Japan.