During the scene where Knox is flying the helicopter to bomb Charlie's house, all three Angels are getting into the helicopter from the bottom. There is a shot of them hanging from the bottom, and then it cuts to a far and wide shot of the helicopter. If you look closely you'll notice that they are no longer on the bottom of the air craft, but they are sitting comfortably on the skies on the left side of the chopper. I'm surprised no one noticed this before.