Between the Goldwater range in Yuma, Luke in Surprise, and Davis-Monthan in Tucson, there is a LOT of military hardware in the sky at all hours.
Sort of unrelated: I think the neatest stuff I've seen yet would have to be the guy in Chandler that does the B-17 tours. I've seen a lot of stuff flyin' around in my time, but I think that those babies are absolutely gorgeous.