BIG pax.
Many years ago I remember taking an A320 from NCL to LHR. During the take-off the aircraft felt 'sluggish', but on final approach to LHR it felt like it was wallowing all over the place.
During my usual 'good-byes' to the pax I noticed about 3 dozen of the biggest human beings I had ever seen close up. It turned out that we had the Newcastle Falcon rugby team onboard!
After re-checking the loadsheet, I saw that load control had used 'standard weights', but those guys were HUGE. I reckoned that we had been about 2500kgs heavier than the plan AND they were all sitting at the back of the aircraft. No wonder the aircraft was wallowing!!
I filed an ASR, and telephoned several departments and contacts, but I feel it just went into the 'too difficult' bin!!