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I had never flown Japan Airlines before, and I have to say I was rather impressed. On the (day) flight back from Tokyo to London, they had a "self serve corner", where passengers could just walk up and help themselves to chocolate bars, other snacks, and non-alcoholic drinks without having to ask a flight attendant.

All that said, one thing that regular fliers learn is that one should never be shy about asking cabin attendents for things. If you want another drink, just ask and they will give you one. Still, the self serve option is nice, and I have never seen it in economy class before. It was interesting to see just how fast the stuff went, too. People genuinely do seem bashful about pressing the "call flight attendant" button.

I have seen it in business class, but there it is almost redundant, as business class cabin attendants are pretty much constantly bringing you stuff without your having to ask for it. (Amongst other things, this means that getting drunk in business class requires no conscious effort).

I have never flown first class, so I can't comment on that. Presumably that will have to wait until my Hollywood career really gets going.