QF924 (0915 tourist-friendly time SYD to CNS) took off at 0947 hours on Saturday 11 June with arrival suggested as 25 minutes late at 1250.
The 1005 SYD to HKG, QF127 departed at 1045. It should be at its destination airport terminal at 1755 hours, 35 minutes late.
The following 1015 hours SYD to HKG, QF83, departed 26 minutes late at 1041 but is not expected to arrive until 1835, 55 minutes late and probably showing what a busy time around 1030 of a morning is normally at SYD for 'heavy' international flight departures, leading to some fairly prolonged waiting for the OK from air traffic control to head skywards.
While there will be many considerations in flight time planning and it must be a complex matter, as good aircraft utilisation is the goal, having two flights to HKG depart close to one another seems like arranging things for the airline's convenience not the passengers', instead of spacing them hours apart to give a day and a night flight in each direction which would be attractive to patrons.
When the then Victorian Railways in the early or mid 1980s revamped its country passenger train schedules and introduced three daily trains each way on most routes, such as to Albury, nicely spaced to give a morning, midday and afternoon departure, patronage increased far more than anyone had thought it would, because the schedules were passenger friendly. Similarly, rail operators in the UK have paid a lot of attention to increasing frequencies on previously neglected days such as Sundays. Largely, it has paid off.
This is one aspect of surface travel operators' timetables where airlines such as QF could learn something, as Australia to HKG is hardly a backwater route and for many a gateway (more efficient than PEK) to mainland China with its 1.3 billion population. AFF member Awesom Andy has advocated similar for another QF route because it is commonsense, provided of course that aircraft utilisation does not decrease. Given that a return rotation is possible to HKG in 24 hours - with a reasonable margin for attention to the aircraft for maintenance - such a change ought be beneficial to passengers and so to the airline.
Who knows, if QF instituted such a schedule change, yields might even increase - and it should bear in mind on a route like HKG it is competing with a carrier in CX that has double the frequency QF can offer.