Hi TS.
In our Global with 13 seat belts...we don't do charter, just owner's trips... average pax load is 2-3. We fill all seats once per year for the annual Christmas trip to Hawaii. A bit tight but only a 4.5 hour flight. The FA is quite busy on this one but usually has most of the dishes done by the time we hit the ground so there's little delay getting to the mai tais.