Spottilludrop
Envy is a terrible, terrible thing.
750XL
Most airlines have, as you know, an SLP, or Standard Loading Plan to those who don't know. It is devised to be simplistic to check yet guaranteeing that the aircraft will be trimmed most efficiently & balanced for all phases of flight while reducing weight as it burns off fuel. One Third- Two Thirds or 1st 100 Bags in Hold 3, next 100 in hold 4, next 50 in hold 2, remainder in hold 3 are 2 of the systems I've encountered & they are easy to check within a couple of minutes on a pocket calculator, as are the passenger distributions in the cabin zones. This data is either taken from the Computerised Load Sheet or Load Form. If it's from the CLS, the aircraft details will be in the database & the take off Stab' trim setting will be calculated & displayed on the CLS. We are used to seeing a Stab Trim setting between a particular range of units. If you had inserted the wrong data into the wrong boxes, the Stab Trim setting will be abnormal & out of the usual range, triggering further investigation, possibly a total offload of pax & bags and starting the loading/boarding process again.
If your 'incorrect' data in 'incorrect' boxes arrives on a Manual Load Form, we have Manual Trim Sheets where bag & pax weights & indices are totalled & the data is plotted on a graph. The resultant MACTOW is plotted & corresponding Stab Trim setting is obtained. If the calculated trim setting is abnormal, we give the Manual Load Form back to the Dispatcher for further investigation & possible offload.
If however, you are saying that your 'incorrect' information is in the hands of the Ramp Staff & that they may 'Mis-Load' the aircraft, that is another matter. That 'failsafe' is hopefully covered by vigilant Pilots who note abnormalities such as more bags going in the front that the back, chatting to Rampers about how other airlines load similar aircraft & by the Rampers querying unusual loading practices.
Cabin distribution isn't a problem as Cabin Crew are trained to spot if the passenger seating distribution isn't normal & they will re-locate passengers if necessary after liaising with the Flight Deck Crew. If this happens, the Dispatcher will be quizzed by the Captain before he signs & accepts the Load sheet.