Thanks, gents.
esreverlluf; not sure what you mean by "conservative side." If i carry 800kg in the aft galley on flight one, of which 300kg ends up in the trash, toilets or stomachs before the the next, this will cause a significant CG shift?
If I've included 800kg pantry at station arm on flight one and inside the operational envelope, then surely physically removing any or all of that weight on the subsequent leg without accounting for the change could leave me well outside the envelope?