For Y09 cars, the orders originated from overseas, these cars for 1970 had the aluminum export tags - whether they were shipped outside the US or not.

When you see Y09 Y11 Y14 together like on the broadcast sheet above, the car was likely ordered from overseas by a US serviceman. He would have picked it up at a dealership of his choice on his return home. I see a fair amount of these cars with N95, likely due to the men returning home through on of the bases in CA.

The Y11 means 'Domestic Publications', meaning that while the order did originate from overseas, the shipping invoice, dealership invoice & window sticker would have shown a US (domestic)address.

Canada shares a border with us, so these cars were not considered 'export' orders, thus the different sales code of Y07. It is the same for cars built at The Windsor, Ontario plant, the cars built there for the US were not 'exports'.