To fly. The Renaissance genius spent years deciphering the flight of birds and devising personal flying machines. On his deathbed in 1519, Leonardo said one of his regrets was that he had never flown.

This time, though, the scene is not a flight of fancy. Lum is a real person, and he really does fly a personal flying machine, typically around five times a day. If you have $190,000 on hand ...

Half a century ago, futurists predicted that personal aircraft would be the norm by the year 2000 or shortly thereafter. Well, it’s 2019 and the promise of a flying car has never been fulfilled.