Try to call - I was looking at one ways ATH-EWR for early July and no availability showed on the website/app. But when I looked at round trips availability showed so I called and they informed me for some days I was looking at there were award tix and I booked. Will be flying F going to ATH as well - snagged those very luckily a few weeks back by chance. Hoping the gamechanger gets deployed to this route next summer