Flying cars face many obstacles, but one of the biggest is accommodating all the parts needed to both drive and fly -- their designs amount to big, heavy compromises. Airbus and Italdesign want to try something different. They've just unveiled the Pop.Up, an autonomous concept that uses a modular passenger capsule to switch between four-wheeled ground transport and quadcopter flight. All you do is tell the vehicle's AI where to go -- it'll snap on air or ground modules based on both the available routes and your habits. Airbus even floats the possibility of shuttling your capsule through hyperloop tubes when they're available.