A British start-up recently pulled off a key maneuver for electric vertical flight—but certification, infrastructure and demand will decide whether air taxis fill our skies On the morning of April 14, 2026, at Cotswold Airport in southwest England, a test pilot rose straight into the air. He was testing the VX4—an electric vertical takeoff and landing (eVTOL) aircraft, or air taxi—built by the British firm Vertical Aerospace. During the test, the VX4's eight propellers lifted it like a drone.