Qantas
PR in trumpeting 'game changing', self flagellation rarely mention Air New Zealand.
Rob Fyfe had the ear of the staff and delivered things Qantas could only dream of, hence their failure to ever compare to Air New Zealand.
My hunch is that a myriad of practical reality will plague the Perth -Heathrow sector. From weather to payload, DVT and lack leg room and other to less obvious things: Like how close to 20 hours will the TOD be? Practically speaking, do Qantas position a standby crew elsewhere in Europe to cover alternate requirements as the crews hit mandatory 'game stopping' crew limits, for reasons of weather en route or at destination.
Rather like abandoning DXB, returning to Singapore is promoted as some sort of victory, conveniently ignoring the reality that five years ago, Qantas operated through Singapore twice daily to London. It also then had a Bangkok service and a Hong Kong Service. Replacing the A388 with a B789 drops the CASK and offer yield improvement potential, but to achieve that the service must be reliable!
The magic eight balls suspects that the service will quietly be reduced to a few times a week in the warmer months, where the sector can be actually flown to destination. Then all of the QF flying to London will be switched back to Singapore. A random walk of stupidity, having surrendered capacity and opportunity to their peers.
Air New Zealand on the route is great, if even just to wind up Qantas!