ALT Last Saturday, high above Canada’s Yukon territory, the pilot of a $150 million U.S. Air Force F-22 Raptor, acting on orders from the leaders of both Canada and the U.S., fired a $472,000 AIM-9X Sidewinder missile at a small unidentified cylindrical object flying at an altitude of 40,000 feet, resulting in a confirmed air-to-air “kill.” What NORAD still hasn’t been able to confirm, almost a week later, is what exactly was blown out of the sky on February 11. Since then, members of the Northern Illinois Bottlecap Balloon Brigade, a club of high-altitude-balloon hobbyists, have been waiting to hear from K9YO-15, the group’s $100 silver mylar “pico” balloon.