I wonder too, and I'm intrigued. At first I was surprised by int'l flights out of Logan Term A (i.e. AMS, LHR, CUN and now CDG) but it looks like BOS could develop as a good reliever for JFK on TATL itins. Makes perfect sense to me, and there seems to be plenty of capacity at Logan A for this to develop. The only glitch in this scenario is that arrivals have to go to Customs at Term E, which isn't too bad but would be better if there could be int'l entry at A.