I second the exterior FPS.  Inside the flight deck I run consistently in the 30s.  Outside I drop to a solid 9-10, it doesn't matter where around the plane I am it is consistent.  I found that out from setting up a basic ChasePlane profile.  My stats aren't as stellar as the OP, but externally I'm never that low.  Even the 757 runs in the 30FPS outside.