Otto Aerospace has successfully completed the Preliminary Design Review (PDR) for its future Phantom 3500 executive jet, the company announced on May 13, 2026.
The Preliminary Design Review (PDR) is an important milestone in the development of a new aircraft type and establishes the baseline design and systems architecture that the company will work on during its path towards certification.
The Phantom 3500 has raised significant expectations in the industry, since it represents a rather unusual design approach when it comes to aerodynamics. For more than two decades, Otto Aerospace has been working on the development of a clean-sheet aircraft that can take full advantage of “laminar flow”.
This is a physics phenomenon that takes place when a fluid moves unimpeded along a smooth surface. Otto Aerospace proposes a clean-sheet fuselage design for its Phantom 3500 that is optimized to take advantage of this effect.
While conventionally powered, the Phantom 3500 promises to cut fuel consumption by up to 60% compared to traditional aircraft of the same size. The trade-off? It will have no windows, although Otto Aerospace aims to make up for that by devising an immersive digitalized cabin interior which would provide a comparable experience for passengers.
Otto Aerospace President and CEO Scott Drennan referred to the significance of this milestone in a statement announcing the PDR completion.
“Engineers often feel like PDR is a test, but I look at it as a celebration of their amazing work. And, yes, they passed the test with flying colors,” Drennan said. “The Phantom 3500 has crossed the threshold from a promising concept to an aircraft we are preparing to build and fly. You can see it in the digital model, in the hardware we have built and in the maturity of the program. The work now is execution. We are focused on building this aircraft on time, while proving that our laminar-flow aircraft can do exactly what we said it would do.”
In designing the Phantom 3500, Otto Aerospace has been able to leverage what it has learned during the development of the Celera 500L, a teardrop-shaped experimental aircraft which flew between 2018 and 2021 to flight test the laminar flow concept.
Otto Aerospace is targeting 2027 for the maiden flight of the Phantom 3500, which has already secured a 300-strong order from executive jet operator Flexjet.
The aircraft will be built at a greenfield factory constructed by Otto Aerospace with the support of the State of Florida, next to Cecil Airport (VQQ) in Jacksonville.