So, when they launched the original 747, the requirement was to evacuate it in under a minute and a half.  That requirement still stands:  The FAA requires that an airplane can be evacuated of all passengers in 90 seconds. Boeing airplane interiors include a number of features to facilitate this process. These features include floor proximity lighting and escape slides.  The things is, we know these are shitlord evacuation drills with not a fatty in sight. Overweight or less physically able passengers are not allowed to be seated in the evacuation rows by the doors. Next flight I take, I'm going to be seated in one of those seats (by hook or by crook).