[BuzzFeed] For six straight days in the middle of March, a small twin-propeller plane flew over Phoenix. Each evening, it picked two or three spots and circled for hours, flying at more than 17,000 feet. The plane was loaded with sophisticated surveillance equipment, including technology developed by the National Security Agency to track cell phones.In June of last year, that same plane spent three weeks circling daily over Wilmington, North Carolina, carrying a state-of-the-art "persistent surveillance" camera that can monitor a large area continuously for hours at a time.
The Phoenix and Wilmington flights are among dozens tracked by BuzzFeed News that were flown by companies run by an obscure, Oklahoma-based private equity fund called Acorn Growth Companies. Acorn’s planes serve as the US military’s "A-Team" for aerial surveillance in Africa, including tracking suspected terrorists’ phones from the air. In the US, the planes sometimes take part in military exercises -- as they were in Phoenix -- helping troops practice raids on targets using the same phone-tracking technology.