I have an SFO - DUS flight booked in J using AA points. I have been trying to get J inventory on the SFO/LAX - TXL flights for my time period (end of August) and it has been impossible. Looking at EF, J is more than 60% booked, and I am assuming those are revenue passengers. This suggests it's a popular route (esp. SFO - TXL) so my hope is that someone will pick it up, though I can't see it being a OW carrier.