Taz welcome to FT !
Yes you would be higher on the list the ealier you check-in. Supposedly NWA is now upgrading in the line of Elite and fare class. Meaning Plat the Gold and then Silver and in each of those groups the go by fare class IE: if you a fare class of K you are the last ones upgrade but you would be on the top of the Silver in K list the earlier you check in.
Hope that helps
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Sorry mama i gots to get all the miles i can
Brian