American Express has made a concerted effort to expand the number of merchants that accept its cards. According to the latest Nilson Report, American Express cards are accepted by 99% of U.S. merchants that accept credit cards.
However, when you travel internationally, your American Express card is less likely to be accepted than a credit card with a Visa or Mastercard logo. Because of this, if your primary credit card is from American Express, it’s a good idea to bring a Visa or Mastercard credit card as a backup. Avoid choosing a card with foreign transaction fees of up to 3% on international purchases.