Seattle Port luggage Valet Service for Flights to Canada

We'll be flying home to Canada from Seattle after we disembark NCL Bliss this summer. Our flight may not leave until later in the afternoon or mid evening. We would like to do some exploring but what to do about luggage? I read about Seattles Port Valet Service where boarding passes and luggage tags are printed on board and they will send the luggage directly from the ship to the airline.

We are most likely going to fly Alaskan which is a participating airline. Not sure if this only applies to U.S. domestic flights only. Wondering if any Canadians have used this service out of Seattle?

After a bit more searching, it appears that it is for U.S. domestic flights only.

It appears it was only domestic flights for Delta so if we go with Alaskan, it looks like we would be eligible. Found another Seattle cruise critic forum where a ship passenger scanned in the form used and international flights were ok (except for Delta). Very happy, it opens up more possibilities for us on debarkation day.

https://boards.cruisecritic.com/showthread.php?t=2485453&highlight=luggage