I don't know what Santa feeds his reindeer. That sleigh moves faster than an SR-71 Blackbird. If you don't know about the Blackbird, it's one of the fastest aircraft ever built. It's ability to fly at supersonic speeds, on the edge of Earth's atmosphere made it a valuable military asset. It was difficult to track, and pursue. Santa, however, is willing to be tracked. He's cooperating the folks at Norad.