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Papilio glaucus
It was bigger than my palm!
This is actually an Eastern Tiger Swallowtail not an Old World Swallowtail! If you check out the wiki links you will be able to see the difference!
I also saw one on my front porch! It was in mid July. I live in Northeast PA. My brother called it a Luna Moth but it looked just like this. Wish I had a picture.