A new Airbus passenger jet completed an ultra-long test flight between Australia and France lasting more than 24 hours—paving the way for the world’s longest nonstop commercial flights starting up next year.

The Airbus A350-1000ULR was developed specifically for Qantas Airways’ planned nonstop flights between Sydney and either New York or London. The Australian airline has ordered a dozen of the new airliners for its Project Sunrise routes that aim to start offering tickets for sale in 2027.

The aircraft had been doing initial test flights near the Airbus facilities in Toulouse, France, with a small team of test pilots and test engineers before conducting its first ultra long-haul test flight last week. After taking off from Toulouse on July 23, it flew for 19 hours and 13 minutes before landing in Melbourne, Australia, on July 24.

That set the stage for the likely record-breaking return flight that lasted for 24 hours and 25 minutes between takeoff from Melbourne on July 27 and landing in Toulouse on July 28.

The flight from Melbourne back to Toulouse covered 12,460 nautical miles in total, according to Airbus. Flight-tracking service Flightradar24 shows the flight route stretched across both the Pacific and Atlantic Oceans along with North America.

To handle such ultra long-range flights, Airbus describes the aircraft as being equipped with an extra rear center fuel tank capable of carrying 20,900 liters (5,521 gallons). That extends the aircraft range by 1,000 nautical miles to ensure it can cover the nearly 10,000 nautical miles for the nonstop flights between Sydney and either London or New York.