I was given a welcome on board my flight to PHL back in August (when I was a Silver) and asked how I was finding the 787.
Also given a thanks for flying on AA last Dec (again, as a Silver).
Best treatment I've been given by far though was my flight to ZAG this past weekend - given "a bit of everything they have" for breakfast, addressed by name throughout and given a goodie bag of G+T to take home with me. Although that was probably more down to the fact I was the one and only passenger in J. Great experience, although I could feel every eye in the Y cabin on me throughout the flight, due to the curtains above the seats not being pulled!