QF 2016 then JQ 537 at Sydney
Broken Hill → Sydney → Melbourne
Timetable, Sydney time
14:45QF 2016 from Broken Hill at the gate
21:05JQ 537 to Melbourne leaves the gate
6 h 20 apart on the timetable
Sydney’s board shows about 68% of departures at their timetable time, so delays of a few minutes don’t show here.
The last days
QF 2016 and JQ 537 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.