Originally Posted by
Rossodio
Try looking at it as a multi-city itinerary - NAP->LHR for one, LHR->IAD for another - and see if that doesn't fix the issue. I booked a trip like this last year and had to do that to make it display.
I've tried this, but even when you can find availability, I find that it ends up getting priced as two separate awards on AA.com.