The incident took place over southern Arizona around 3:30 p.m. on Feb. 24 between the New Mexico border and the Sonoran Desert National Monument, which is about 40 miles from Phoenix.
The Drive reported that one witness, a commercial pilot flying a jet for American Airlines, said the object was above 40,000 feet and had a big reflection.
"I don't know what it was," the pilot told Albuquerque Air Route Traffic Control Center. "It wasn't an airplane but it was … the path was going in the opposite direction."
Air traffic control told an aircraft on a similar flight path to let him know if anything passes over him in the next few miles.