On Saturday 20 August, QF63 (B789 VH-ZNG, the 0930 hours midmorning SYD across to JNB) did not take off until 1157 hours so gate arrival became 1757, 142 minutes behind schedule. The aircraft turned around and is operating QF64, the 1735 hours redeye not in the sky until 2036.
On Sunday 21, SYD at gate arrival looks like 1542 mid afternoon, also as luck would have it 142 minutes behind the eight ball.
The official estimate of this B789's next flight QF7 (1540 hours SYD - DFW) departing at 1650 hours this afternoon is optimistic: 1720 or later is probable.
'The 81' on Saturday 20 had A332 VH-EBO airborne at 1230, arriving SIN (ex SYD) at 1843 hours, 53 late, but thanks to more generous turnaround times than 'the 64 to 7' enjoys, the next two flights of EBO from SIN to SYD and on to AKL have been, or should be, arriving early.
In theory, the relatively short turnarounds for these B789 long haul rosters are good for shareholders (and management KPIs), but if things go a bit awry, delays can compound.
B789 VH-ZNJ on QF10 should arrive in PER today at 1248, 68 late as on Saturday 20 it took off from LHR at 1303 compared to a timetabled pushback of 1155 hours. This means a likely delayed arrival in MEL of more than half an hour: 1910 hours or beyond. At this stage, QF93, the 2110 hours MEL - LAX that is the next ZNJ flight should depart on time.