Originally Posted by
cesco.g
It's kind of a headscratcher that 300nm seem to make such a difference !? - not questioning your assessment though, EWR764.
As EWR764 indicated, the plane is at its max. Top it of that the great circle distance is always going to be less than what actually gets flown due to takeoff and landing maneuvers, getting routed around weather, headwinds, the plane will have to be at max fuel load but less than max weight in order to reliably and safely make each flight.
David