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Why Boeing decided against building a stretched double-decked 747-9

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Why Boeing decided against building a stretched double-decked 747-9
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CEO Kelly Ortberg | Boeing

The Boeing 747, known as the "Queen of the Skies," was produced for over five decades and became a significant part of aviation history. Its recognizable upper deck "hump" originated from a design that prioritized cargo transport, with the cockpit raised to allow freight loading through the nose. Initially, Boeing did not intend for airlines to use this space for passenger seating.

Over time, later versions of the 747 saw an expanded upper deck, which typically housed premium seats but remained smaller than the main cabin below. The idea of a Boeing 747-9 emerged as a potential response to Airbus’s A380, envisioning a full-length upper deck capable of carrying up to 600 passengers in multiple classes. This would have placed Boeing in direct competition with Airbus’s only full double-decker aircraft.

However, several factors led Boeing to abandon the 747-9 concept. As noted by YouTube creator Swiss001 in simulation analyses, such an aircraft would have faced challenges due to its sheer size and weight. It likely would have required upgraded engines and significant technological improvements. Extending the upper deck would also have meant redesigning critical components like landing gear and wings to handle additional weight.

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Market trends played a role as well. Airlines began favoring point-to-point travel using smaller planes rather than operating large hub-to-hub flights with very high-capacity jets. While carriers such as Emirates and Lufthansa successfully operated A380s on international routes, others retired their fleets early due to operational costs and changing demand—Air France and Thai Airways among them.

For profitability, an aircraft like the 747-9 would have needed consistently high passenger loads and robust cargo demand. Additionally, it would have been limited in terms of airport compatibility because many airports lack infrastructure suitable for such large planes.

Boeing instead chose to focus on developing newer models like the 787 Dreamliner. The Dreamliner has become popular among major airlines—including All Nippon Airways (ANA), United Airlines, American Airlines, Qatar Airways, and Japan Airlines—due to its fuel efficiency and suitability for long-haul point-to-point routes previously considered unviable for larger aircraft.

The shift away from ultra-large four-engine jets accelerated after Airbus announced it would end production of the A380 in February 2019. Operational limitations at airports—such as runway width requirements—and higher costs contributed to this decision.

With production of the 747 line ending in January 2023 after more than five generations and over 1,500 units built, most airlines are retiring their remaining fleets or replacing them with more efficient twin-engine models. Some operators—including Lufthansa and Korean Air—continue flying their remaining aircraft where they remain essential for certain operations.

Speculation remains about future designs from Boeing that could fill market gaps between existing models like the 737 and 787; any new development is expected to prioritize efficiency over capacity seen in concepts like the shelved 747-9.

"Swiss001 even believed that the extended aircraft would likely have needed an engine upgrade, along with other technological enhancements."

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