Just went back and looked at the pics. An error: The one labeled "Blackbird" isn't. It's either a YF-12 or a YF12A. Couldn't tell from the pic, if it has sub rudders folded under it's a YF-12, without the subrudders it's a YF-12A. ALL the SR-71's were "Two-Holers," with visible windows for the second crewman about 6' behind the pilot. I was there, Charlie.

An engine PAIR is fine fare.

WLR