Jetstar is an Australian low-cost airline headquartered in Melbourne, Victoria. It is a wholly owned subsidiary of Qantas, created in response to the threat posed by the airline Virgin Blue. Jetstar is part of Qantas' two brand strategy of having Qantas Airways for the premium full-service market and Jetstar for the low-cost market. As of June 2015, Jetstar was carrying 8.5% of all passengers travelling in and out of Australia.
SOURCE: Wikipedia