Too bad (for you - and me too) the only issuer of the AGR cc is Chase. :angry: (I don't like Chase either!) And I had a Continental Airlines MC also - but that was also from Chase! I cancelled that one!
If you want AGR points from a credit card, you must have the AGR cc issued by Chase. The only other way (and I don't even know if it's possible) is if you have an AX, and you have Membership Rewards (and if MR can be transfered to CO - I'm not sure), you might be able to transfer then to CO and then transfer those miles to AGR. (Like I said, I'm not sure if this can be done.)