Otto Aviation Selects Secondo Mona for Phantom 3500 Fuel System

Otto Aviation, a pioneering force in sustainable aviation, announces it has selected Secondo Mona S.p.A. as its partner for the design, development and supply of the integrated fuel system for the company’s revolutionary Phantom 3500 aircraft.

The partnership marks a key milestone in the development of the Phantom 3500, a clean-sheet business jet engineered to burn 60 percent less fuel than comparable aircraft and fly up to 3,500 nautical miles while drastically reducing emissions through the use of 100% sustainable aviation fuel (SAF).

“Secondo Mona is a company with deep aerospace heritage and unmatched experience in designing and delivering complex fuel systems,” says Scott Drennan, president and COO of Otto Aviation. “Their ability to engineer a lightweight, highly integrated system that supports both long-range performance and full SAF compatibility makes them the ideal partner for the Phantom 3500. We’re thrilled to have them onboard as we bring this revolutionary aircraft to life.”

Founded more than 120 years ago, Secondo Mona is a global provider in aerospace fuel systems, with a proven track record of delivering mission-critical solutions to major OEMs and military programs. For the Phantom 3500, the company is designing a custom fuel system that supports the aircraft’s aerodynamic efficiency and structural integration goals, with features including:

• SAF compatibility — fully compatible with 100% sustainable aviation fuel, contributing to Otto Aviation’s goal of drastically reducing carbon emissions
• Precision integration with laminar architecture — a fuel system engineered to fit precisely within the Phantom 3500’s unique laminar fuselage and wing structures, ensuring both aerodynamic preservation and structural balance
• Advanced automation — equipped with smart sensors, real-time fuel monitoring, and automated flow control to enhance pilot situational awareness and operational safety
• Lightweight and maintainable — designed for minimal weight, high reliability, and ease of service to ensure lower lifecycle costs and high aircraft availability.

The collaboration reinforces Otto Aviation’s strategy of aligning with best-in-class suppliers who share its commitment to performance, precision engineering, and environmental responsibility. Secondo Mona’s experience in fuel-system integration for advanced aircraft makes it a critical contributor to the Phantom 3500’s path toward flight testing and certification.

“Secondo Mona is a true partner in this program,” continues Drennan. “Their willingness to invest in the success of the Phantom 3500 through risk-sharing speaks volumes about their belief in both our aircraft and our business plan. They recognize the market shift toward sustainable aviation and are excited to be a major part of this program.”

With this partnership, Otto Aviation continues to advance its progress toward its first flight campaign, planned for early 2027, and certification ahead of entry into service in 2030.

For more information, visit ottoaviation.com.