The Platinum Card® from American Express is one of the most popular premium cards around, and for good reason. Upon enrollment, you can score high-end travel benefits like airport lounge access, complimentary hotel and rental car elite status, and numerous statement credits that help offset its $895 annual fee (rates & fees). However, you might not know that there are multiple variations of the card that are co-issued by different banks.American Express partners with Morgan Stanley and Charles Schwab to off ...