NORAD, the Pentagon‘s command defending North America, was tracking the Chinese surveillance balloon well before it entered U.S. or Canadian airspace, its commander said Monday, noting that at about 200 feet tall and carrying a payload the size of a jet airliner, it would have been hard for trackers to miss. But Air Force Gen. Glen VanHerck, commander of NORAD, said that as the suspected spy surveillance craft made its way across Alaska and Canada before crossing back into U.S. territory last week, there wasn’t much the military could do without a presidential order to act, given there was no...