For the 60th consecutive year, North American Aerospace Defence Command - or NORAD - is continuing its tradition of giving youngsters the real-time location of Santa Claus on his annual storybook world tour.
The hub of the so-called Santa Tracker is located at Colorado's Peterson Air Force base.
Hundreds of volunteers are waiting there to answer calls from an estimated 125,000 children around the globe looking for Santa's whereabouts.
This year, Major General Charles Luckey is heading the tracking team.
He explains how their work progresses.
" we track him pretty closely and stay in pretty much constant communication with him. As you know, we're monitoring him with a number of different sensors around the globe. And, we track not only where is he and where's he going to be next, but also approximately how many gifts have already been delivered and things of that sort. And we're just making sure he has safe and secure flight as he circumnavigates the globe at the speed of star light. So, pretty much so far, we're what we'd call 'ops normal' here, which means it's a good day. Everything seems to be on track."
In places like Alaska, however, remote NORAD identification technicians who monitor computer screens 24 hours a day for possible air incursions, also spend Christmas Eve serving as official Santa "trackers."