Table B2 - JAR-OPS Standard weight values for each piece of checked-in baggage
Available data does not show large differences between summer and winter weights. No difference was therefore made. Short-haul flights are predominantly used by businessmen travelling without checked-in baggage. On long-haul flights, there are obviously less “hand baggage only “passengers. The non-scheduled “summer holiday” passenger is generally lighter and carries less hand baggage.
In practice, although the male/female ratio depicts large variations, there are many flights with significantly less than 20% female passengers, and there are not a lot of high quality surveys available. Therefore a conservative ratio of 80 / 20 was retained for determining the present all-adult standard weight value of 84 kg on
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring

BACKGROUND
scheduled flights. For non-scheduled flights (76 kg) a 50 / 50 ratio was chosen. Any variation from these ratios on specific routes or flights would have to be substantiated by a survey-weighing plan.
The use of other standard weights is also considered in the JAR-OPS:
-A suitable statistical method is given in Appendix 1 to JAR-OPS 1.620(g) for verification or updating of standard weight values for passengers and baggage, should an airline choose to prove other weights by looking into its own operations. This would involve taking random samples, the selection of which should be representative of passenger volume (weighing at least 2000 pax), type of operation and frequency of flights on various routes. Significant variations in passenger and baggage weights must clearly be accounted for. Anyway, a review of these weights would have to be performed every five years, and the load sheet should always contain references to the weighting method hereby adopted.
-Results of the airline weighing survey should then be validated and approved by the Authority before the airline-standard weight actually becomes applicable.
FAR guidelines
The FAA has issued an Advisory Circular (ref. AC 120-27C) to provide methods and procedures for developing weight and balance control. Similarly to JAR-OPS, it also involves initial and periodic re-weighting of aircraft (every 3 years) to determine average empty and actual operating weight and CG position for a fleet group of the same model and configuration. The following standard average weights were adopted and are reminded in the following tables.
Type of flight  Male  Female  Children (2~12 years old)  All adult 
Summer flights (from May, 1st till October, 31st)  88 kg 195 lb  70 kg 155 lb  36 kg 80 lb  82 kg 180 lb 
Winter flights (from November 1st till April, 30th)  91 kg 200 lb  73 kg 160 lb  36 kg 80 lb  84 kg 185 lb 

Table B3 - AC 120-27C Standard passenger weights including hand baggage
　
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