I found a unicorn for late May, early April, and then I found a double rainbow unicorn!
I had almost given up trying east coast gateways to anywhere in Europe for this summer. Then in November, suddenly, PHL-LHR-FRA opened up with AA metal to LHR and BA to FRA. No BA fees. I wondered if I could get pushy and originate it from Nashville. And it worked! I could go BNA-PHL-LHR-FRA all in J for 57.5K.
So, now I am getting really cocky. I try FRA back to Nashville in June and the Double Rainbow Unicorn appears! A J class saver 57.5K redemption including the non stop BA flight from LHR right in to Nashville.
Fees are high ($800), but I remember reading on FT to split the reservation into 2 one ways. So, sure enough, splitting it drops the fee down to about $400. $400 and no repositioning flights and no airport hotels at repositioning airports? I will take it.
So, they are really tough to find, but I was shocked I found it. I was getting really frustrated but finally it clicked. Plus, I had completely eliminated BA at first due to the fees, but then tried it as one ways and the fees became a little more acceptable.