JQ506, the coronavirus pandemic period Thursday 28 May 2020 MEL to SYD scheduled to depart at 0900 hours took off at 1011, arriving 45 minutes late at 1115 hours. Aircraft was A320 VH-VQC. So far this has been its only flight for seven days.
I'd have thought that if an aircraft was mothballed, it would stay so, and that a subfleet would be in reasonably regular use.
The only other departures publicly showing as timetabled by JQ today ex MEL were JQ780 to ADL and JQ709 down to HBA. Sparse.
JQ519, the 1110 hours SYD back down to MEL was operated by VH_VQX, pushing back at 1215 and taking off at 1231 hours. Consequently, arrival in the southern capital was at 1341, 56 late. It was then only seven minutes late arriving HBA at 1542 mid afternoon on JQ709, but its next flight, JQ712 from HBA to MEL, the 1615 hours, did not take off until 1741 so at gate arrival was 1841, 71 behind schedule.