Noticed an odd track for this flight today. SAAB Due in to Ballina, Picked it up circling at Tweed Heads about 5PM, and ending up landing at Brisbane.
Weather in BNK was heavy rain and low cloud, but visibility was OK based on METARs at the time.
Rex does not fly pax to Brisbane but perhaps it was on its way to Townsville? They do fly Townsville - Mt Isa.