EI doing a codeshare on BOS-YYZ/YOW/YUL/YHZ would be good to see - surely Jetblue can't object as they don't serve Canadian destinations plus it might keep the BOS-SNN service ticking over.
Be a pity to see TS squeezed out by "AC Jetstar" - us expats are damn glad of their fares compared to AC's rapaciousness and BA's huge fees and taxes.