Jetstar have put out a press release regarding the Protected Industrial Action commencing on Friday 13th December.
You can read their CEO's response.
There will be rolling effects on Jetstar services for a 7 day period from 13th December to 20th December 2019.Please consider this when choosing your airline for freight choice during your booking.Delays in delivery via air are not grounds for refunds or claims. We recommend that you use Virgin Australia if at all possible.