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I remember hearing about someone buying a multi-million dollar artwork with their platinum amex once, so it would seem so.

Platinum Amex I doubt. Maybe with a Centurion card.

The so-called "Black Amex" card has been used to purchase a ~$30 million aircraft, according to American Express.

Mark Cuban bought a Gulfstream V over the internet with his American Express card.

Only yahoo to create basement dweller millionaires