Tr-3b Black Manta – The US Air Force’s Most Secretive Anti Gravity Spy Plane!Welcome back. to Skyward Fighter! Today, we’re diving into the most secretive aircraft in the U.S. Air Force’s black projects: the TR-3B Black Manta. This triangular aircraft is rumored to use anti-gravity propulsion, making it the closest thing to a real-life UFO built by human hands. If that sounds impossible, strap in—because this is going to be one of the wildest rides in aviation history.