Was it a balloon, plane or UFO spotted over Arizona sky?

Two pilots note something passed above them in the skies north of Tucson on Feb. 24. They didn't know if it was a balloon, a plane or something else. Was it a UFO? Something strange spotted in the Arizona sky Two pilots note something passed above them in the skies north of Tucson on Feb. 24. They didn't know if it was a balloon, a plane or something else.