Aha. Thanks. I was thrown off because even though I was specifically searching for "Business Platinum", lots of the offers that are explicitly titled "Business Platinum" nevertheless turn out to be for the "Platinum Business" cards when I look more closely at the cards themselves in the ads. I guess those won't get me the benefits I wanted. Ah well.

So I have one more question. If I do get the $300 Business Platinum card, and I want to get into a Northwest Airlines lounge, do they always check to see if I'm flying NWA that day? Or can I often/sometimes/occasionally/never get in on just having the card itself, even if I'm flying a different airline?