American Express issues two types of cards. Charge cards (Platinum, Gold, Green, Plum) -and- Credit cards. There is a limit of five
credit cards, personal and business combined. Read here:
Amex USA 4 or 5 "Credit" Card Limit.
Yes, that I know. SO currently has
3 2 total Amex cards and had 3 when I tried to do the app before.