Well i think Q.A. applies some "discrimination" and "priority"depending of what king of passenger you are (first class or not...) and surely wich destination you are travelling to.....! (like london :the "prestige" flight.....or what else ...).
This remind me a Khartoum flight i did, and guess what: a lot of baggages were Not loaded on board of the aircraft, because of the cargo there was no place anymore for baggage!And of course passengers were not adviced!
So in Karthoum terminal it was almost revolution amongst the passenger when they went to pick up their bags, the red cap told us....!...5 stars airlines!
Welcome!