There's reasonable demand all year round for an ATL service from EDI but probably not enough to make a profit using a 767-300.
One of the problems with last year's service was the late departure time from EDI which resulted in very late arrival times for those using connections beyond ATL.
I suspect that the timings were constrained by the availability of suitable stands and other facilities at EDI and I also suspect that this issue is constraining other long-haul expansion from EDI. Would anyone "in the know" be able to comment?