Qantas Airways Ltd flew non-stop to Sydney from London in about 19 1/2 hours, a test run for the world's longest commercial service.
The Boeing 787-9 Dreamliner lands in Sydney on Friday.
The London-Sydney flight is actually 1500 km further than NY to Sydney, but is shorter due to prevailing tailwinds.
The London to Sydney flight comes after Qantas' non-stop NY to Sydney service last month, with a third research flight planned by the airline.
In a note to clients published in July, they forecast non-stop flights from Sydney to London and NY could add A$180 million (£96 million) annually to the carrier's profit before tax, which was A$A1.3 billion in the financial year ended June 30.
"If people are able to fly point to point they are willing to pay a little bit more than if they have a stopover on the way through - it makes it so much easier for them, " said Thomas.
The test flights aim to improve the wellbeing of crew and passengers on ultra long-haul journeys. They were monitored before, after and during the flight for levels of melatonin, the hormone that influences sleep cycles.
Qantas London to Sydney flight has become the longest commercial airline passenger flight both in terms of distance and duration.
Commanded by Captain Helen Trenerry, the service recreated Qantas' historic non-stop flight between the two cities 30 years ago.
The flight from London Heathrow flew across 11 countries including England, Netherlands, Germany, Poland, Belarus, Russia, Kazakhstan, China, Philippines and Indonesia before crossing the Australian coast near Darwin and tracking southeast across Australia towards Sydney.
The carrier has challenged both Boeing and Airbus to supply the aircraft it'll need in 2022 - with Boeing's 777X-9 and Airbus's A350-1000 both in the frame.
Earlier this week, Qantas announced its pledge to cut carbon emissions to net zero by 2050. CEO Joyce said it would achieve this through the use of new - as yet unavailable - aircraft, aviation technology and fuel types. The airline used a Boeing 747, ripping out most of the seats and loading the plane with as much fuel as possible, even towing it to the runway in order to conserve gas, CNN reports. It carried just 23 people and had to be towed to the runway to conserve every ounce of gas.