Science fiction typically says we should already have flying cars and jetpacks, and, in fact, the technology does exist. But ...

Companies like Alef Aeronautics are taking orders for vehicles that drive on roads and fly through the air. But the technology comes with eye-watering costs.

If any place in the U.S. embodies the convergence of science fiction and reality, it’s Silicon Valley. Alef Aeronautics is one of several Bay Area companies competing to combine the two in the ...