Oh look, SO, cruise FO, however you would like to label them they are cadets who have been hand picked through the toughest of application processes then trained at full cost of the "legacy" carrier and then put into a cockpit environment with 3 to 4 crew
That's not the case; they are not cruise FO's, they are fully fledged F/O's and they more often than not operate just two crews. But then again, the Singapore Airlines cadets are exposed to the Learjet 45 before doing their line training, so they're well prepared for jet operations before flying the line. Some of their cadets actually go from flying the C172 for their ab-intio training directly to the Learjet, bypassing the Baron for their initial twin rating altogether. (BTW, I believe the Learjets are currently being replaced by the Citation Mustangs).
And what makes you think Jetstar wouldn't have a tough application process with an estimated 20,000 potential applicants?