Jamie is correct about this being a purple martin, chimney swifts have a very distinct shape in flight. Their wings are set far forward on the body, are really long, and point backwards.
oh and purple martins don't have a very forked trail when its spread
http://birds.audubon.org/sites/default/files/imagecache/bird-full/species_images/Purple_Martin_c22-34-456_l_1.jpg
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