Eastern Tiger Swallowtail (Papilio glaucus)

Despite missing nearly a quarter of it's right wing, this butterfly didn't seen to have any trouble flying.

Note: This could be a Canadian Tiger Swallowtail (Papilio canadensis) instead, as both species look basically identical. Everything I've found says the normal range for P. canadensis is farther north and/or east, so P. glaucus is probably correct.