Originally Posted by
ClipperDelta
M fares are usually much cheaper when originating outside the U.S. If one travels/commutes frequently internationally, it may be worth it to do a one way to the non-US destination, and then start purchasing M roundtrips from the non-US destination instead.
This is generally true, but you'll have to do the homework. I've invariably found that ex-Asia to be much cheaper but this is not going to be helpful IMHO, unless you're a serious MR enthusiast. For example, Thailand has a summer promo right now to the U.S. on L,U,T for roughly 30,000B or 1,000US.
I concur with the previous post re: YYZ. Alternatively, I've found PDX to be a nice option with lots of Z availability, though it used to be equipped with 768 (opposed to A330, but not sure what it is now).