I actually wonder if the surge of travel demand to Japan would allow Jetstar to try launching Cairns - Okinawa?
Okinawa is 5154km or 5 hours 45 minutes away from Cairns, which it can potentially fits well with a domestic connection from East Coast utilising one plane or hook up with DPS routes which is 3 hours 45 minutes away from CNS.
It is easily within reach with a A321LR/XLR, and Okinawa has a lot of beaches and paradise like resorts.
Opening Okinawa would make transferring to Kyushu faster with its alliance with Japan Airlines and Jetstar Japan.