Global airlines are increasingly aiming for ultra-long haul flights and Airbus SE said it expects more carriers to order planes that can fly from one end of the Earth to the other.

The European planemaker sees demand for between 50 and 100 orders for a longer-range version of the A350 model, capable of flying from Sydney to London nonstop, Airbus’s chief salesman Eric Schulz said in Sydney Sunday.

Airbus and its rival Boeing Co. are talking to Qantas Airways Ltd., Australia’s biggest carrier, for a plane that can fly the Sydney-London route without a break, company officials said. Called Project Sunrise, it would put Rio de Janeiro, Cape Town, New York or Paris within direct reach of Australia’s eastern seaboard, according to Qantas. Air New Zealand Ltd. could also consider a longer-range version of the A350, Airbus’s Schulz said.

“The heart of that long-range market will continue to be in Asia,” Randy Tinseth, vice president of marketing for Boeing commercial, said separately in an interview in Sydney.

The Chicago-based planemaker is still in talks with Qantas about the exact plane that can fly Sydney to London nonstop, Tinseth said. One long-range market with particular potential is Asia-Latin America, he said, adding it’s “hard to say” how many of those aircraft would be sold worldwide beyond Qantas.

A wave of ultra-long flights that will get you halfway around the world in one hop is pushing aircraft manufacturers to come up with planes and engines that can ferry people for 19 and 20 hours nonstop. This year, Qantas started a Perth to London 17-hour service using a Boeing Co. Dreamliner and Singapore Airlines Ltd. last month said it’s reviving the Singapore-New York service, a 19-hour flight that will become the world’s longest.

Airbus is assessing all options, including reducing seat capacity, adding more fuel cells and modifications to engines, Schulz said.

Qantas Chief Executive Officer Alan Joyce has challenged both Airbus and Boeing to build a jet by 2022 that can fly 20 hours fully loaded from Sydney to London without a break.

Joyce has described nonstop flights to New York and London from Australian cities such as Sydney and Melbourne as the “last frontier” of aviation, after which all of the world’s major cities will have non-stop air links. Options for making such long flights more bearable would include introducing a new four-class structure, with part of the cargo hold utilized for sleeping berths, Joyce has said.

The airline’s first Perth-London flight started in March, signaling the beginning of the end of the so-called Kangaroo Route, which has seen planes make the journey from Europe to Australia in a series of hops since the advent of aviation.