At this point, just add AMEX Starpoints and use it whenever you can, and use your AA business card when someplace doesn't take AMEX. Try it for a year and see how much you end up charging on your AA card. The $85 a year AA card (world platinum) allows a cap of 100,000 a year earned without status, and with your AMEX being the main card the AA card might not be used that much. Also you can get secondary cards on AMEX at no fee and each card has it's own number so your employees could be gotten cards if you like - also as first choice.I don't know how much the AA business card costs compared to the world platinum card, nor the pluses or minuses of one compared to the other. My AA card fee is waived because I have a citigold account at Citibank (numerous threads about that account elsewhere).