While this might work well (although it might never be exactly the same, unless the 3rd party airplane has used exactly the same 220 lbs calculation) with planes with a full passenger configuration, those with a 'combi' configuration won't be very accurate. So, as explained on the GSX manual (), GSX estimates the number of passengers by dividing the total station load by 220 lbs, which is the industry standard for an average weight of pax+luggage, and this has always been used to calculate the passengers boarding/deboarding times. The number of passengers is not a standard system in the sim, but something that airplane developers simulate in many different ways, either from external loaders, or with internal simulations, which might be progressive or not, there's no standard.
