It's a sad but open secret that a small number of freight operators sometimes abuse MTOW limits (at least I hope it's a small number).
Many years ago, at a 747 operators conference, I was eating lunch with representatives from a now defunct Asian freight operator. I was talking about a proposed 747 derivative that would have a million pound MTOW - one of the reps commented along the line of 'so what, we've been doing that for years'.
