Originally Posted by
Cazza_fly
The shorter routes, for example IAD, is made possible by fitting in between rotations so to speak.
Not so at all. The IAD rotation is a good length to be operated by one aircraft repeatedly, and this is normally what happens. I see that XLEC is operating it both today and tomorrow (27/28 Jul), last week XLEE operated it for three consecutive days. Any aircraft change is down to separate requirements. JFK would be the same.