Kaisa Siren, Lehtikuva / AP
Monday, Dec. 24, 2012 | 1:50 a.m.
Volunteers are pulling on their Santa hats, phone lines are set, and tracking screens are ready — NORAD Tracks Santa is primed for its 57th annual goodwill mission.
Santa trackers start taking calls early Monday, telling children _ and some adults _ when Santa is due at their house. The last shift won't end until nearly 24 hours later.
The number is 877-HI-NORAD or 877-446-6723.
The operation is based at Peterson Air Force Base in Colorado Springs, Colo., home of the North American Aerospace Defense Command.
NORAD Tracks Santa began in 1955 when a newspaper ad listed the wrong phone number for kids to call Santa. They wound up calling the Continental Air Defense Command, NORAD's predecessor.