DENVER: Santa's trackers at the North American Aerospace Defense Command say they are breaking records this Christmas Eve.

Volunteers at Peterson Air Force Base in Colorado had fielded more than 80,000 calls Saturday evening, breaking its record, as they told the mostly young callers where Santa was flying.

Volunteers at NORAD Tracks Santa said kids started calling at 4 a.m. Saturday to find out where Santa was.

"The phones are ringing like crazy," Lt. Cmdr. Bill Lewis said Saturday.

The NORAD has been telling anxious children about Santa's whereabouts every year since 1955. That was the year a Colorado Springs newspaper ad invited kids to call Santa on a hotline, but the number had a typo, and dozens of kids wound up talking to the Continental Aerospace Defense Command, NORAD's predecessor.

The officers on duty played along and began sharing reports on Santa's progress. It's now a deep-rooted tradition at NORAD, a joint U.S.-Canada command that monitors the North American skies and seas from a control center at Peterson.

Santa's first stop in the U.S. came shortly after 9 p.m. in Atlanta, said Canadian Navy Lt. Al Blondin.

NORAD's Santa updates are blowing up on social media, too. In addition to the website and Facebook and Twitter pages, Santa this year has a new tracking app for smart phones. The app includes the Elf Toss, a game similar to Angry Birds.

Santa's NORAD Facebook page exceeded 920,000 "likes" by midafternoon. Last year, Santa had 716,000 "likes."

First lady Michelle Obama was among the volunteers for a second year in a row. She took about 10 calls from her family's holiday vacation in Hawaii. Lewis said Obama's voice didn't startle any of the phoning children.

"They all just asked run-of-the-mill stuff. They wanted to know about Santa," Lewis said.