General Motors has inched slightly closer to fulfilling its quest to put the world in flying cars. As part of the 2021 virtual Consumer Electronics Show on Tuesday, GM showed renderings and animation of what it dubbed its Cadillac Halo concepts: the Cadillac Personal Autonomous Vehicle, which is like a fancy self-driving taxi, and Cadillac Vertical Take-off and Landing (VTOL) vehicle, a sleek and futuristic drone-like flying car. "The VTOL is GM's first foray into air travel," said Michael Simcoe, GM's vice president of global design. Advances in electric vehicles and other technology are now "making personal air travel possible," he said. Simcoe's presentation came in the middle of GM CEO Mary Barra's keynote address to CES, the annual exhibition normally held in Las Vegas that features the latest technology.