Hey Tool.
Why are QF 737 operating services on Wet lease to Jetstar?
I can answer that one. It is because the 3 A320 aircraft that were scheduled to be in service for the Christmas rush were delayed for reasons beyond J*'s control. So as High n Mighty said "lack of equipment" not tech crew is the answer.
I have got to say I never cease to be amazed when pilots (who know absolutely everything about running an airline) constantly quote "crew shortage" yet managemant (who know nothing about running an airline) disagree but said airline continues to operate. Safely, profitably, continually.
Why is that?