Thanks! I always get the same lady there so I am hoping she is there tomorrow morning. And I agree, they usually just look at boarding passes and ID. But the PC lady on the phone said there "might" be a problem. I didn't quite understand what she was saying, something about Senator versus Ambassador or something like that.
I really don't anticipate a problem, but am bringing my receipt, just in case. I know the Plat card is the same number as the PC card so maybe that is why they take the Plat card? But my card's strip doesn't work so we'll see!