As said, Doug, this works only on full fare and only one pax gets the miles which are substantial since it is only available for international flights,. It worked out for us on,y 2x and I always check just to be sure.

And I stand corrected, we used miles to get to South Africa and used the Amex companion ticket to Australia. Another drawback was that my husband had an emergency at home that req'd his presence but I stayed. Since his was the companion ticket we had to pay a fortune for a full fare one way ticket back to LA as his ticket was no good if I was not w him.

Rachel, I did not know about the alert feature, that sounds really good to have.
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Helen