Kevin, this one had me guessing for quite a while. First, what a beautiful bird. As I kept staring at it, and trying to consider its physical features, I realized it had a very small bill, and looks like long wings. I also noted the placement of its legs, and thought it must be a swift or swallow. I am not very familiar with either of these species, but looking in a couple of my guides under swifts, I realized none of them looked like your photo. So then I thought to look around under swallows, and I came across the Northern Rough-winged Swallow. Is that what it is?