IFO 2020...

Conceptual artist and researcher Mark McCandlish discussed unusual and secretive technologies related to aircraft and UFOs. He first became exposed to experimental and clandestine projects while creating technical illustrations for aerospace companies such as Lockheed. One such vehicle, which later became known as the Aurora, could travel at speeds up to 17,000 mph, he estimated, and made use of three different propulsion systems.
Many of the triangular sightings, such as seen across United States, have a terrestrial source-- the U.S. military, said McCandlish, who compared these types of craft to airships or blimps. Such ships could be covered in a special radar absorbing paint and be outfitted with noise cancelling technology, he said. Their ability to travel up to 350-400 mph would correspond with the locations of the Phoenix Lights witnesses who first began to see a triangular craft in Henderson, Nevada, on the night of March 13, 1997, he explained.

Unusual And Secretive Technologies of UFOs with Mark Mark McCandlish
https://www.youtube.com/watch?v=WYBbKxrNcag&t=298s