Since when was profitability the bottom line for Aerlingus on the North Atlantic. They operated loss making services from Shannon to the US for many years with both 747's and A330's particularly during the Winter months.
I'd question if SNN-JFK and SNN-BOS are profitable even now. Hence the switch to 757's. The real test of EI's commitment to Shannon will come when the Government gets around to selling it's shares in the company.