Yes, I'm doing DFW-DOH, QR metal, using the AA codeshare. Also starting the DONE3 doing HND-JFK, JL metal, using AA codeshare. No trouble with AA RTW.

Important note: Out of the 3 people I spoke to about 3 weeks ago, 2 were very knowledgeable. After AA rate desk approved my itin, I wanted to change it but the 2nd agent saw the first flight was JL metal and said it should be booked with JL. I pointed out the rate desk already approved it and the changes were only later in the itin. . She put me on hold and came back and then made the changes. But when submitting it screwed something up and I had to call 2 days later. The 3rd agent was great like the 1st one, so like maybe the AA RTW also needs HUCA if they tell you something strange.