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Papilio multicaudata
Spotted at Jacob Lake Inn, Arizona.
More pics and links for comparison and info.
Western: http://bugguide.net/node/view/24573
Two-tailed: http://bugguide.net/node/view/23914
It's definitely a swallowtail. It's hard to tell which kind because of the angle of the picture but it looks like it's most likely a two-tailed swallowtail. Also, the two-tailed swallowtail is the official butterfly of Arizona, where this one was spotted. http://www.statesymbolsusa.org/Arizona/s...
Looks like a Two-tailed Swallowtail, but Arizona also has the Western Swallowtail which is similar. So I am sure someone can narrow it down