Fox News correspondent Lucas Tomlinson joins'Fox News Live' with the latest on a Chinese spy balloon being shot down by the U.S. military while hovering off the South Carolina coast. An artificial intelligence algorithm developed by DARPA's Air Combat Evolution (ACE) program flew a modified F-16 fighter jet for over 17 hours in December, officials announced this week. The jet, a Variable In-flight Simulation Test Aircraft (VISTA), took off from Edwards Air Force Base in California, marking the first time that artificial intelligence has been used to fly a tactical aircraft. A Variable In-flight Simulation Test Aircraft being controlled by artificial intelligence in a flight over California. "We conducted multiple sorties [takeoffs and landings] with numerous test points performed on each sortie to test the algorithms under varying starting conditions, against various simulated adversaries, and with simulated weapons capabilities," Air Force Lt. Col. Ryan "Hal" Hefron, the DARPA program manager for ACE, said in a statement.