A search at
Find an agreement | Fair Work Australia for jetstar will find the following relevant document
Jetstar Airways Engineering And Maintenance Agreement 2009
Agreement ID: AC319856 Industry: Airline operations
FWA Matter No.: WPA ID: CAEN095869422
Employer name: JETSTAR AIRWAYS PTY LIMITED
Trading name: JETSTAR AIRWAYS PTY LIMITED ABN: 33 069 720 243
It appears to be an employee agreement rather than a Union agreement.