My son happens to be one of my more faithful blog readers (Hi Connor!), and needed a letter to Santa sent Priority Mail last week.
You may or may not know, that the North American Aerospace Defense Command tracks Santa every year!
I was fortunate enough to tour NORAD back when I was an Air Force ROTC cadet, and can confirm that they track millions of objects in both air and space, including Santa.
Still skeptical? Check out their dedicated tracking site at: http://www.noradsanta.org/
See also: General