Originally Posted by
RobertS975
Certainly for domestic tineraries, I have checked luggage through many times even when on separate tickets. It is commonplace out in Hawaii where Hawaiian will check your luggage through to DL or NW or whoever even though it is a completely separate ticket. Horizon has also done this when I am connecting to DL in PDX or SEA.
Not sure about international, but if you have the confirm, I will bet yes.
The baggage is not the issue, is the boarding passes.