Like QF/JQ and VA haven't had similar delays....
Then why the delay, ATC, weather, tech ....
Are turnback's counted as delays or cancelations, if cancelations, what is the delay for each passenger as they get shunted onto later flights, often next day
If 50 pax on a flight from SYD-MEL that is cancelled by QF/JQ or VA are bumped over to fill empty seats on the next 3 flights, this should count as 1 cancelation + 3 delayed
Just sayin