Hello all I am a long time lurker and have learned a lot from the collective.

I have a flight MTY-IAH-YYZ So two international flights, I want to check my bag at MTY( because my wife wants a bunch of crap brought home) and not have to collect it in Houston then recheck it.

So the question is can I check my bag at MTY trough to Toronto?

Also I have status with AC but the flight from MTY is united. Will they affix a priority tag on the bag for me?