I have a question. This came to mind after recently flying on a commuter plane where the pilot requested a few passengers move aft until after takeoff. How is the CG determined on a commercial airliner, where the number of people vary and the size of the people vary also along with the size and weight of the luggage / cargo. With the advent of supersizing fast food meals, I would think the variety of the weight range of passengers would have an effect on the CG. I know with the r/c models, 1/4" can make a huge difference. Just thought I would toss this out, to satisfy my curiosity. Thanks