Qantas Jetstar'? As far as I know, it's registered as Jetstar Airways Ltd, and trades as Jetstar
Because that's what Jetstar do. Whenever they are
1. In the poo with CASA
2. Have some safety problem
3. Screw up monumentally
4. Need to improve their image to the travelling public
they wheel out the old "Jetstar a QANTAS group company"
Everytime.