when impulse airlines was about to fold, qantas bought them and made them part of qantaslink, which is what they are flying as atm.
When Qantas announced the launch of this new airline, impulse put in the bid to run it, as they already have a small company and crew and wouldnt take much to start up. Impulse have since won te bid so now all those working for impulse will eventually become jetstar instead of qantaslink.