11Fan , 09-21-2007 10:43 AM
Working Class Dog
Two schools of thought.
Check out airliners.net, do a search on MD-11 cockpits. There's one picture there taken by Sam Chui of a Varig which shows the Left, Right, and Aft Observers seat (which rotates and elevates.
Some of the MD-11 customers had a fourth seat installed, just to the left/aft of the Captain's chair.
There was also a fold-down jumpseat, just as you enter the cockpit, on the left.
So, two driving, up to three along for the ride.