I checked back in my itineraries, because I remember an AA curtain on an MD-80... Found it... I was on a AA MD80 Redeye (AA#2482) LAX - DFW in August and it had a new mesh curtain between F and Y. The flight was full in all classes. I was seated in 4B and saw no one from Y pass through the F cabin to the F lav on the 3 hour flight... The curtain worked! A day later I was again seated in 4B on a return daytime flight, sans curtain, and at least 10 pax trekked through the F cabin to use the forward lav.