Defense firm L3Harris Technologies is working with air taxi maker Joby Aviation to develop a vertical take-off and landing aircraft for defense applications, the companies said on Friday.

Flight testing for the new military-grade version of Joby's VTOL aircraft is planned for fall 2025, with operational demonstrations expected in 2026.

Joby's gas turbine hybrid VTOL aircraft is designed for low-altitude missions and offers both piloted and fully autonomous flying.

"The next-generation of vertical lift technology enables long-range, crewed-uncrewed teaming for a range of missions," said Jon Rambeau, president of Integrated Mission Systems at L3Harris.

Developing aircraft with dual-purpose tech

Joby CEO JoeBen Bevirt said the company has been working with the Department of Defense over the past decade to develop aircraft with dual-purpose technologies, including a gas turbine hybrid powertrain for its current S4 aircraft platform.

A technician gestures to a pilot flying an experimental Joby Dubai Aerial Taxi aircraft in Dubai, United Arab Emirates, June 30, 2025.
A technician gestures to a pilot flying an experimental Joby Dubai Aerial Taxi aircraft in Dubai, United Arab Emirates, June 30, 2025. (credit: AMR ALFIKY/ REUTERS)

The Joby S4 is an electric VTOL aircraft designed as an air taxi for urban air mobility that can carry one pilot and four passengers.