Picture this: you step off a long flight, drag your luggage through the terminal, and join a queue at the rental desk. Twenty minutes later you are still waiting, and the agent is reading out insurance options you barely understand. Now imagine skipping all of that. You walk straight to your car, unlock it with your phone, and drive away. That is the promise of keyless car rental, and it is changing how people think about getting behind the wheel of a hired vehicle.