One airline (close neighbor to USA) ordered their longhaul bird with all structural ungrades for highest TOGW/MLW, but then had lightweight brakes installed to reduce MLW to "optimize" (heh...) their landing fees. This "derated" plane met their current mission requirements.
But they had the option to regain full spec performance in the future by buying the bigger brakes and attendant paperwork.
This may be more common today, but 30 years ago it was a clever, legal dodge.
