Just put less fuel in the bird and ban German passengers or obese passengers and give discounts to anorexic passengers. If you multiply 550 x 150, they are most of the way there. Make those statutory passengers go on a diet. Don't serve soda or junk food either and only give high protein meals to those few passengers who are actually paying a high enough premium to get fed and I think you have a solution.
Well.......how bout no meals, no drinks, no water, no potty paper or potty rooms, everybody leaves their shoes behind and and only a total combined luggage of ten pounds. That outta get her down to flying weight!!!
Oh, and all coin, cash and jewelry can be left in my box at the head of the boarding ramp. There, that'll do it.