The North American Aerospace Defense Command defends North American airspace 24 hours a day, 365 days a year.

Santa Claus, along with his reindeer, has set off for his biggest night of the year on Christmas eve, making several stops on his route around the world in less than 24 hours.

The president will participate in taking calls to the North American Aerospace Defense Command (NORAD) — a joint United States and Canadian operation typically charged with monitoring the skies for th...