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Ehh. Surprisingly enough, my 16th-level party doesn't fly much, and have generally been able to ground their few aerial opponents one way or another. So I just mistakenly calaculated a staight distance. I'll refresh my rules on aerial movement. (Actually, annoying as it may be, that is one of the benefits I'm gaining from this - a rules refresh.)
OK, the end point is 55N15E35H, and the entry point is 85N0E0H.