SIN is a standout because they have the one airline ground handler, SATS (AFAIK) that handles the baggage, so they have total control over the systems, by comparison at BNE you have AGH (owned by BNE airport), QF (Express Ground Handling), Toll Dnata, & Oceania to name a few.
SIN actually has 2 ground handlers, SATS and CIAS. There also used to be Swissport but I think they've pulled out of SIN.
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