It will be costing GTE, the organisation which have chartered it, a lot more than the ACMI going rate for this type, which I suspect your software may be using. Also, I think your assumption of break-even at 50% load may be optimistic.
Eastern won't be taking any financial risk on this route as such - GTE will have to pay them regardless of how many seats they sell.
Still, its nice to see someone taking the proverbial plunge in these difficult times.