Thanks guys, I just assumed they wouldnt be able to take a box of fish onto the plane with them. Good to learn all this for next time I guess. I will avoid UPS I guess and try Fedex.
***I will be heading to LA for canadian thanksgiving in the middle of October. Maybe I should just pay for extra luggage and bring it on the flight with me? They're paying me back for any shipping costs so it doesn't matter too much, just want it to get to their hands still frozen.