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sg: This doesn't really make any sense. You can do the calculation for any particular plane. I use the Boeing 737 classic specs (http://en.wikipedia.org/wiki/Boeing_737). The plane has an empty weight between 69,000 and 74,000 pounds (depending on the configuration). I'll use 72,000. It will carry between 108 and 159 passengers. I'll use 133.

Fuel capacity is 53,000 gallons. At 6 lbs per gallon jet fuel weight that gives fuel weight of 31,800 pounds.

Total of empty weight plus fuel weight is 103,800 pounds.

I was an ingineur at Boeings. Worked on the wing center section of the 737-100. IIRC, the design weight was 114,000 pounds, which includes the plane, fuel, and passengers. When the static test exceeded design levels by 10%, they immediately started the -200 (stretched version) to use the extra capability, or 125,000 pounds. The design has obviously continued to evolve. (Totally irrelevant to the discussion, but I was there.)

Using your figures, the plane plus fuel is 77% of takeoff weight, passengers plus luggage 23%. Crew is neglected, as is food, etc. consumed in flight. But the passengers need to pay 100% of the cost, plus a profit. You are straining too hard. The plane also needs to show a profit at less than 100% occupancy. and what to do when the obese passenger boards a 100% full plane? I would advocate an oversized seat for overweight passengers. Pay a premium to get thst seat. Of course, lots of skinny folks would pay to get that seat, too. So adjust the nmber of fat seats to meet the damand. If it turns out to be 10%, make 10% fat seats. If an obese person buys a regular ticket, he can be denied boarding unless a fat seat is available, for which he pays the premium.

Easy peasy.

Count Uptoten

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