Airports

So everytime I've been at an airport in the last 2 years or so (and that's a lot of times), the announcement is that the terror alert level has recently been raised to orange. I don't think I've ever been at an airport when it wasn't orange. So it begs the question: Do they just leave it at orange all the time and just try to scare people by saying its been recently upgraded, or am I some sort of terror threat that I'm not aware of and they raise it only when I fly? Hmmmm......