Originally Posted by Kate_Canuck

In deciding whether the Platinum Amex is worth it for lounge access, you also need to check whether it will work for you on the routes you usually fly. For example, if you regularly fly from airport x on Co but that Co uses NWA's lounge, your Amex won't get you into NWA's lounge (it would only get you into a Co lounge with a Co airline ticket).