Very interesting! After receiving a PM from another flyertalker who had flown in a like-configured aircraft and felt row 39 was exactly the same as any standard Y seat, I double checked the seating chart on NWA.com -- as it turns out, it looks like they blocked out row 39 and moved us to row 37 (yuck!) -- I took davetravels advice and rearranged the seating to be 22D and 22F (exits)...