NORAD’s annual tracking of Santa has endured since the Cold War, predating ugly sweater parties and Mariah Carey classics.

NORAD typically scans the heavens for potential threats. But on Christmas Eve, volunteers are fielding questions like, "When is Santa coming?"

Each year, at least 100,000 kids call the North American Aerospace Defense Command to inquire about Santa’s location. Millions more follow online in nine languages.

Air Force General Glen VanHerck, NORAD's commander: "24 hours a day, 365 days a year, NORAD defends North America by tracking airplanes, missiles, space launches and anything else that flies in or around the North American continent. As we have since 1955, this Dec. 24th we are once again ready for our no-fail mission of tracking Santa."

Santa Claus is moving fast, delivering millions of gifts around the world on Christmas Eve. See where he is now.