Balances cannot be transferred from your American Express Platinum Credit Card to another American Express Card or Bank account.

美国运通白金信用卡之信用额，不能转至其他美国运通信用卡或银行账户。

youdao

Now this is a San Francisco-based tech loving guy who tried every trick the internet offered, and then called his American Express Platinum Card travel agent, and none of it got the fare down one cent.

FORBES: Why You Need A Travel Agent, Part 2