Originally Posted by YAKflyer

Your comments are interesting to me. I flew the 777-200 for DL and the rest facility was not authorized for occupancy below 25,000' for the reasons you stated. After leaving Delta I spent a couple of years at Air India flying the 777-300. The Air India planes also had the upstairs rest facilities, but they were authorized for all phases of light. The original Delta 777s were modified after delivery, so I thought that was the reason the ventilation was restricted on those planes. When I got to AI I figured the installations were done at the factory and were more useful because they were more of a standard component. At AI I had folks upstairs for takeoff and landing several times and no one ever complained about the ventilation. Now I wonder if Boeing has two different ways of installing those rest facilities.