Originally Posted by
jayer
At the risk of being contradicted online, some have posted on FlyerTalk that they have had better success with American Express backing them up in billing disputes than the Average Large Credit-Card Issuing Bank. Perhaps others can comment on Amex relevant experiences.
From the merchant's perspective, AMEX is usually a lose-lose situation. Their interchange rates (rates they charge merchants) are higher than MC/VISA and they tend to be more pro-Consumer in chargeback disputes. Good for consumers, bad for merchants.
That said, my family has lost 1 legitimate AMEX dispute (overcharging on a cruise ship) and 0 Chase/Citi MC/VISA disputes.