My favorite activity on Point.com is GPX. I usually trade CO for AA, DL or F9 at 1:3 ratio and for PCR at 1:4. Miles usually end up costing me 0.33¢/mile, PCR at 0.25¢/point. Trading away AA will cost you more but I think you could average about 0.6¢ - 0.7¢/mile. Your fees on GPX are for the miles you are trading out, not for the miles you receive. There is a trading fee chart on the site. This is a link: Chart.