I don't understand the cost savings on fuel load.
Less fuel = less weight = less lift = less drag = less thrust = less fuel consumption = less cost.
However, less fuel = more chance of running out = more chance of crashing = passengers travel with safer airlines = much more cost (well, less profit, anyway)
Anyway, before I got sidetracked, I really came here to say.......
"Rules are for the obedience of fools and the guidance of wise men."
Douglas Bader