I'm going with Kris here and saying this is a yellow-rumped, but it's a close call.
The biggest thing is that pretty pronounced yellow spot on its side; female pine warblers tend to not have nearly such a definitive yellow spot--if they have that yellow coloration there at all, it tends to be a bit more diffuse.
The other thing is the bill. Pine warblers have a thicker bill than the yellow-rumped, and while I'm not good enough at ID to tell without comparing it to something else, I think this one isn't quite as thick as the pine warbler's bill.
I don't suppose you got a picture that shows its rump? If it has a yellow spot on the rump, it's definitely yellow-rumped. If there's no spot...well, then the jury is still out.
Whatever...it's a nice photo of a nice bird!
Yeesh... some people have to complicate everything. It's a BIRD!
^Truth.
Man, sometimes I wish I'd *never* started trying to figure out what bird I had a picture of. It's one thing to want to know if you have a sparrow or a bluebird--but there are approximately 46 thousand different kinds of sparrows and warblers--and then for each one, it depends on whether it's male or female, adult or juvenile, breeding or non-breeding.
It's absolutely maddening and I don't know how, nor indeed WHY, "birders" get to where they can just tell as it flies past what it is.