flightasia: On the SIN-PER flights I have taken, (at least for the cabin crew) usually a couple of the crew would have done SYD-SIN, overnighted for one night, then fly SIN-PER-SIN turn around (QF72/QF71) then overnight, then fly SIN-SYD. I've also had crew who do SYD-PER-SIN at one shot. and SYD-PER and PER-SIN have the same flight times. They're on Aussie terms and conditions.
Jetstar's DRW base regularly do DRW-SGN turnarounds (and they're overnights) and they're on Australian terms and conditions -DRW-SGN is only 100 miles shorter than SIN-PER, so there would be virtually no difference in flight times.
SQ chooses to have their crew do nightstops in PER and TPE perhaps because they want their crew in tip top shape. Jetstar chooses not to, and some QF crew don't for the SIN-PER sector.
Oh plenty of negative press in the Singapore media on SQ. Every week there is a letter to The Straits Times on why SIA didn't treat someone properly, and as it is a national sport in Australia to bash QF, it is also a national sport in SIN to bash SQ.
The Jetstar VH aircraft that does PER-SIN is wetleased to Jetstar Asia for the day and usually does a SIN-BKK-SIN turnaround before returning to PER in the evening. So a VH aircraft is operating a SIN-BKK-SIN or SIN-PEN-SIN sector. Should Singaporeans be upset that an Australian registered aircraft is operating those sectors?