It is desireable to land an aircraft with as little weight onboard as possible - that is as close to zero fuel as possible with a comfortable but not excessive emergency reserve.
The hold baggage is weighed.
Cargo is weighed.
Each passenger is averaged out at a certain weight - 80 kg? because it would raise sensitivity issues if the airline weighed their travellers. Though being ranty some people are increasingly taking the piss with their carry on. I mean NFBSK me a suitcase is not carry on. Really! You've saved a couple of quid - congratulations - but a different rant for a different day. Anyway, self loading baggage isn't weighed.
And all that goes into the fuel equation. X kilogrammes of cargo plus Y kilogrammes of passenger baggage plus the averaging of the total weight of Y passengers, times the flight distance, divided by the aircrafts fuel economy plus a bit in case we have to circle the airport a few times, or diverte to our alternate - that's how much fuel we want. The pilots don't want to run out of fuel, but the pilots don't want to land heavy.
However I can't imagine that the human waste in the passengers combined makes a jot of difference in that equation which is part pure numbers, and part pure guesswork.
I've no idea what an average turd weighs - let's assume half a kilogramme which I think would be on the generous side, So 300 passengers = 150 kilogrammes of feaces that could have been lost at the airport. Okay, 150 Kg of fuel gets a jetliner how far? How much of a saving is 150 kg of self loading cargo?
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