For ages DL didn't provide slippers - an absolute essential, IMO - in J, except for flights to/from Japan. I got used to collecting disposable slippers for use on DL (and other) airline flights that don't transit Asia and bringing my own for flights where it's not provided. Is it that now DL is consistently providing slippers on all Delta One flights (incl. domestic ones like HNL-ATL/JFK, TATL, S America flights, etc.)? Would help to know, as carry-on space is obviously limited.