The Joby S4 is a five-seat electric vertical takeoff and landing (eVTOL) aircraft. AFWERX Agility Prime announced April 25, 2023, that it has entered into a third extension of its Small Business Innovation Research (SBIR) Phase III contract with Joby. The extension enables options for Joby to deliver up to nine of its low acoustic signature, zero-operating emissions S4 aircraft to the Air Force and other government partners. The first two Joby aircraft will be delivered to Edwards Air Force Base, Calif., before March 2024. (Courtesy photo)