In the last three months of 2019, well before the pandemic's worldwide effect on air travel, Qantas Airlines operated three very long "research flights," as it described them, to gauge the effects of all that time in the air on the well-being of the passengers and crew. Part of an initiative called "Project Sunrise," the flights were ultra-long-hauls that each lasted more than 19 hours. For example, the second of the flights saw a Boeing 787 Dreamliner cruising from London to Sydney in November, with a tidy flight time of 19 hours and 19 minutes. 

Today, Qantas announced that it was gearing up for takeoff for more flights like that, with an order for a dozen new Airbus A350-1000 aircraft, all of which will be "capable of flying direct from Australia to any other city including New York and London," the company said in a statement. Those flights are set to begin at the start of 2025, Qantas said, and if the air time from those research flights is any indication, expect them to last around 19 hours in the sky. 

Ultra-long-haul flights are nothing new, of course, and in November of 2020, Singapore Airlines launched an exceptionally long route between New York City and Singapore. The metrics from just one of those specific flights, traveling from Southeast Asia to the East Coast of the US, are impressive: The plane was in the air for around 17 hours, departing with some 238,540 pounds of fuel on board for a journey that spanned almost 9,000 nautical miles. 

If it feels like international flights on large planes are getting longer, that's because they have been—at least before the pandemic, and just slightly. Andy Buchanan, a transportation expert at Oliver Wyman, a consulting firm, reports that they were getting longer both by distance traveled and flight time. From 2010 to 2019, the average mileage covered per nonstop flight globally among wide-body aircraft (think: a big plane with two aisles) increased by around 8 percent, he says. Also from 2010 to 2019, the percentage of flights that were between 12 and 15 hours long increased by about two percent, and those between 15 and 18 hours long increased by about the same amount.