I usually live qantas and never have a problem. However the aircraft used for this 6 hour journey was a domestic 737. These aircraft are fine for domestic flights of around 2 hours or less but for this length of time the interior seating plan is way too cramped and I am 5'1. It didn't help that my seat was broken and the food served was that which you would get on domestic trips. So not substantial. I recommend not flying qantas if it's this small aircraft for longer than 2 hours. Otherwise I would always use qantas internationally if the aircraft is a larger size and have done so in the past with zero complaints.