also saint-hubert flying school and OAS (ottawa aviation services) offers I-ATPL, OAS has new management now and its really great too, Ottawa flying club as well non profit, as mentioned above moncton from what i heard from my friends who instructed there is a fun place
note all of the above I have flown with them and recommend it (except for moncton but always hear positive reviews)
honestly alot of great schools but more importantly is the instructor you choose, if you go with harv's air ask for Adam!