Perhaps the person answering DJMeatBall's question about other United Mileage Plus Visa cards can identify those cards. The "regular" (non-business) Platinum is distinct from the Signature Visa card or one in a series of variations on that same card? (I have what I have, and I am satisfied with the product, but they have me utterly confused with all the "variations" on the card. How is a "business" version of the Platinum card different from "non-business" or personal? Call center was clueless when I tried to enroll through them rather than using link provided here on FT.)