I have a brand new DC-9-50, trying to put it on a IND - LGA route. Bear in mind this is a BRAND NEW Bird, with 140 hours.
When I try to add flights, it tells me there are no aircraft available to fly the route.
So to prevent the obvious answers, as I said it has 140 hours available, the Distance is 658 miles, and the planes Range is 1700.
I had thought it might be the Perimeter rule but it's no flights over 1500 miles, so I'm well within that....