Last night coming back from Gothenburg, I was greeted with "Hello Mr Shefgab, welcome back". Such a small amount of effort from the crew, but made me feel a little bit special, and a more valued customer. First time it's happened to me on BA.
Waaay back in 2003, I had a member of crew on SQ who addressed me my name the entire flight AKL-SIN, not back for a teenager in Y!