Originally Posted by hannu
The first AJ's pic shows us bird's pattern of outermost tail feather and the shape of the pattern refers either Upcher's Warbler or Eastern Olivaceous Warbler ssp pallida. There seems to be clear hollow on the outer web of t6. However, the amount of white and wide and diffuse white inner web on t6 refers better to Upcher's. That habit of semi-fanning its tail (like in first pic) and waving it around as it is poorly fixed (2nd pic) refers also Upcher's.
You might like to check out the following page - I have toned down the sun on AJ's pictures and have these images together with shots of both Upchers and Olivaceous for comparison - see what you think