Canon Rebel xti
Canon 100-400mm 5.6L IS USM
400mm focal length
F8
1/2500/sec
ISO 400
I am pretty confident this is a Warbler and I believe it to be a Pine Warbler, because, well he was in the Pines!
I cropped the image about 20 % because the angle from the ground to the the subject must have covered a vertical of at least 20-25 feet and I got a lot of sky. I cropped out the sky and brought the image forward without sacrificing too much detail.
Very neat photo, but the bird is a Yellow-rumped Warbler of the eastern "Myrtle" race. It's a shame the head isn't backed by sky, but maybe some of the PS experts here can tell you how to remove the plant.
Definitely a Yellow-rump (or "Yumper" or "Butter-butt" as known around here). Good work catching him in flight. I agree with Paul that it might be worth attempting some careful cloning to remove the RH foliage. Blue sky looks a little oversaturated to my eye.
Also a good job on removal of the conflicting bg branches.
For a different composition you might try a crop from the left right down through the middle of the highest branch. Sort of to move the bird to the left and give more room to fly into.