I've also been seeing metal security curtains temporarily pulled across the aisle, so that the cockpit, the restroom, and the front kitchen are all behind a met

I've also been seeing metal security curtains temporarily pulled across the aisle, so that the cockpit, the restroom, and the front kitchen are all behind a metal curtain, sort of like this: http://www.windowanddoorsecurity.ca/img/SecurityCurtain.JPG http://www.windowanddoorsecurity.ca/img/SecurityCurtain.JPG Most recently on a Logan-LAX United Airlines nonstop in February. This allowed secure restroom breaks, as well as food service to the cockpit.