Interesting observations on recent flight:

(1) On a JL31 77W flight from HND to BKK, there was a very proactive male flight attendant in economy cabin. Although he was not the cabin attendant in charged of the economy cabin (another crew in beige and white jacket took charge of the economy cabin), he was the crew making all the announcements for economy cabin and greeting passengers at the door during boarding / disembarkation. I think he might be quite senior.

(2) On a JL51 789 flight from HND to SYD, the cabin attendant in beige and white jacket in economy was obviously much more senior than the chief cabin attendant. Chatted with her and she has worked with JAL for 40 years. Perhaps it was intentional that she worked in the economy cabin to train the new crews, otherwise it did not make sense why she was not the chief cabin attendant.