I can assure you that in the real world, a well attended 737-800 does not have 3000nm range. Most international flights require an alternate, and Nausori is usually unsuitable, leaving Apia, La Tontouta and Port Vila. (exemptions exist for airports with non-intersecting runways like SYD)
A real 737 , with liferafts, catering, rear hold cargo system etc tops out not far beyond the 2400nm that SYD/BNE/MEL to DPS requires. Virgin's PER-HKT was close to limit but doable. Plenty of good alternates around and before HKT.
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