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Papilio troilus
You can see the markings on the wing clearly. This looks more like a Spicebush Swallowtail to me.
Here are a couple photos for comparison.
Spicebush Swallowtail: http://bugguide.net/node/view/1131287/bg...
Dark morph Eastern Tiger Swallowtail:
http://bugguide.net/node/view/1099343/bg...
Please note that the Eastern Tiger Swallowtail has a dark body while the Spicebush Swallowtail has light markings.