Most modern aircraft are so designed that if all seats
are occupied, all baggage allowed by the baggage
compartment is carried, and all of the fuel tanks are
full, the aircraft will be grossly overloaded. This type of
design requires the pilot to give great consideration to the
requirements of the trip. If maximum range is required,
occupants or baggage must be left behind, or if the
maximum load must be carried, the range, dictated by the
amount of fuel on board, must be reduced.