In regard to the possible OOL-SYD leg of a possible SIN-OOL-SYD flight, I haven't read anything to suggest that OOL and SYD would be hit in a single fight, it is possible that Scoot could offer 2 separate and direct SIN-OOL and SIN-SYD services. However, I would assume that the OOL-SYD leg would only be able to be flown in conjunction with a corresponding international Scoot flight. The only airlines that offer domestic service from a international terminal are QF and JQ (AO also did before they were JQed), DJ/VA maybe allowed but as far as I am aware they keep their domestic and international service separate. Many other international carriers do fly between 2 or more domestic Australian ports, possibly because this is more economical than flying separate flights from their own home hub. I personally have flown on TG BKK-SYD-MEL and a CX HKG-CNS-BNE flights. These carriers do not offer these domestic legs separately, they can only be flown if they are part of an international flight on the same flight number (and honestly I can not see any benefit from a PAX pov having these domestic stops, even if chasing FFP and Status the domestic leg is ignored because it is one flight number). It was pointed out that QF does offer a SYD-LAX-JFK flight but that can not be booked as a stand alone domestic American flight. It can only be booked in conjunction with a QF flight to LAX. Now I as understand the issue with Jetstar is that they were using foreign crew from there international arms to operate Australian domestic flight on non Australian conditions, which some people have an issue with.
Anyway in regard to Scoot it seems very unlikely that they will offer domestic Australian service even if they do fly SIN-OOL-SYD(-SIN) so they probably wont have to worry about Australian employment conditions.
The DFO by the runway is becoming an international hotspot I see.
