It seems that ex-Canada AONE3 fares are about $10K in USD vs $14K USD for originating in the US (BOS).

What issues, constraints etc are there with originating in YUL or YYZ and then connecting w JL in ORD to NRT?

I could also fly from YUL to NY or BOS and then to NRT or HKG on JL or CX?

Can I ticket an itinerary online or w AA RTW that originates in Canada? Can I Ticket it now ex_YUL and then fly to Canada in 4 months and originate there?