Dining for Miles Question
 

If I have a credit card hooked up through Northwest Airlines and another card hooked up through American Airlines, can I eat at the same restaurant in the same month using the two different cards and still get the miles for both? Any advice appreciated.

Yes, you are able to do so. I do it all the time. In fact, I have about six different credit cards that I have linked to the various frequent flyer mile accounts. The rules apply to each account separately.

I tried to link my credit card with United's DfMiles program yesterday (it's already linked to Northwest Worldperks) trying to double dip. The rep on the phone told me that my credit card is ineligible since it showed up as used for another airline's Dining for MIles program...so, at least for United and NOrthwest, this can not be done...

You can not link the same CC to 2 different dining for miles programs. You can register 2 different CCs in different dining programs.

You cannot link the SAME credit card to different airline programs. BUT you can link several credit cards to one or varying airline programs. With more than one credit card you can credit on the second card for a subsequent visit in the same month.