Having watched some of the presentation videos, I find it somewhat unclear where the simulation determines the actual payload from. I've seen where in the FMS one can enter the payload via the CDU interface, but one can enter any arbitrary numbers there, which may or may not match the actual payload present on the aircraft. I've come up with the following hypotheses: I've seen the FBO request sheet where we can enter the crew and passenger counts, but with no precision whatsoever