GS John,
Yes, Airbus delivered an A340-300 in the late 90's to Cathay Pacific that was almost entirely covered in 3M's Riblet film. I don't know the official verdict of the trial but think the initial minor improvement disappeared with time. The film was removed after about 5 years. It gave the aircraft an odd satin finish.
I think the aircraft was B-HXC msn 142 (or B-HXD msn 147)