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By Scott Hamilton
Part 1
April 9, 2026, © Leeham News: CEO Kelly Ortberg has been clear: there won’t be any new airplane program launched until the airlines are ready, the technology is ready, and Boeing is ready.
Ortberg became CEO of The Boeing Co. on Aug. 8, 2024. One of his first decisions was to kill the research and development of a concept called the X-66A, the moniker for a Transonic Truss Brace Wing (TTBW) single-aisle airliner that could replace the 737 MAX in the coming decade.
However, he said that Boeing, coupled with NASA, would continue to research and develop an advanced wing for a new, highly efficient airplane. NASA, the National Aeronautics and Space Administration, has a long history of partnering with Boeing to evaluate new aerospace development.
Ortberg’s decision to kill the X-66A demonstrator project reversed a decision by the man he replaced, David Calhoun, who was the TTBW’s leading proponent within Boeing. Calhoun became CEO in January 2020 when his predecessor, Dennis Muilenburg, was fired during the prolonged 737 MAX crisis.
Figure 1. The Boeing-NASA concept X-66A TTBW airplane. Source: NASA.
One of Calhoun’s first decisions was to kill the R&D project of a New Midmarket Airplane (NMA), a twin-aisle design roughly the same dimensions as the Boeing 767-200ER and -300ER. The NMA had been under study since at least 2012. Muilenburg was on the path to seek board approval to launch this program in 2019, when the MAX was grounded by global regulators. Calhoun, the lead director, didn’t support the plane. With Boeing’s cash-cow 737 grounded, Calhoun used the crisis to kill the NMA. Given the billions of dollars in losses Boeing was and would incur, the decision was an obvious one.
