I think this is an Ash-throated Flycatcher because of the combination of head shape (flared small crest), bill size/ shape (tubular and very Myiarchus-y, but smaller than Great or Brown-crested). The very pale, whitish gray upper chest and lemon lower belly also look good for Ash-throated - even at this point in the summer, other Myiarchus in the US usually show darker gray on the throat and brighter yellow bellies (even Dusky-capped is usually obviously yellow here). Since I can't see much of the underside of the tail, I wouldn't bother with it too much unless there are other photos available. The subdued rufous panel at the base of the flight feathers and thin, moderately contrasting edge to the tertials is also fine for ATFL - on a Great-crested especially, this would be wider and paler (sharp, almost white contrast). I'm not familiar enough with Nutting's Flycatcher to comment on that as a very
outside possibility.