I've partaken of a bit of travel lately. If Virgin or Qantas are the same price as REX or even a few bucks more, I'm going with VA or QF. I've got a credit card that gets me in to the Virgin lounge, I've got a few passes floating around for QF. Rarely are Jetstar cheaper than a VA flight if you're flexible with flight times. REX fares appear random, it's like they set prices randomly not via an algorithm, and Jetstar's algorithm looks weird when some of their flights cost more than a QF. Either way, the pair of them are weird.