The correct American Express number format is a 15-digit number starting with 3.
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The correct format for an American Express account number is a 15-digit number starting with 3.
The correct format for an American Express (AMEX) card number is a 15-digit number starting with 3.
The correct format for an American Express card number, which consists of 15 digits, is XXXX XXXXXX XXXXX.
An American Express credit card number is typically 15 digits long and starts with the number 3.
An American Express card number starts with the number 3 and is 15 digits long.