Sort of. If the flight was R>0 at T-7, and a seat next to me was assigned, it is a pretty good bet they are paid J. Conversely, you can see who is called at the gate. And as I do pay reasonable attention to R and J/C/Z space at expert flyer, I can make some guesses. Not totally accurate, but enough to convince me that there is certainly reasonable paid J traffic on the route (and bear in mind my sample size is in the large # of hundreds at this point!).