이거 원래 본인이 사용해야 하는걸로 알았는데 아닌가봐요...

Thank you for renewing your Platinum Delta SkyMiles® Credit Card. We appreciate your loyalty and are excited to let you know that your Companion Certificate is now available for redemption*. Help a loved one or friend's travel dream come true by redeeming for one round-trip domestic Main Cabin flight. 

Want to give someone their own adventure? You can redeem your Companion Certificate for others, even if you are not traveling on the itinerary. With so many options for how to enjoy this perk, there's no reason to miss out.