Company "A" W+B
Company "A" does a [I]Getting to Grips With[I] document on Weight and Balance. Rather lightweight (groan). It doesn't do peanuts but manages to do "movement" of potable water with a straight face. Cue the usual jokes.
BTW I think is weight (force) and not mass in this instance. No doubt Virgin Galactic calculate COI in the vast heavens and Lord Knows maybe COM too.