31 March 2026
US kitplane manufacturer Sonex has closed, citing a combination of financial pressures and declining sales.
In a direct video statement to customers and the wider aviation community, company owner Mark Schaible confirmed that the decision had been made following what he described as a “perfect storm” of challenges.
These included a sharp drop in sales, rising operational costs, increased competition — particularly from used aircraft already in circulation — and mounting pressure from lenders unwilling to continue supporting the company’s debts after several unprofitable years.
Sonex Highwing outside the Oshkosh hangar. Photo: Sonex
Schaible, who has been involved with Sonex since 2003 and took ownership in 2022, said the decision had to be made suddenly as cash flow constraints left the business unable to continue trading. He also revealed that both the company and his personal finances are now entering bankruptcy proceedings.
Founded in Oshkosh, Wisconsin, Sonex built a strong reputation within the experimental and homebuilt aviation sector, offering affordable kit aircraft designed for amateur construction. Its product line included models such as the Sonex, Waiex, and Onex, along with the SubSonex personal jet.
Schaible acknowledged the broader impact of the closure, apologising to employees, suppliers, and customers who may be financially affected. He paid tribute to Sonex staff, describing them as “talented and dedicated,” and expressed hope they would find new opportunities quickly.
Founder John Monnett and the SubSonex jet
The announcement raises uncertainty for the global fleet of Sonex aircraft and for customers with outstanding kit orders, particularly those awaiting delivery of the company’s high-wing model kits. Schaible indicated that discussions are ongoing with vendors and industry contacts to find a third party willing to support existing aircraft owners and potentially continue limited aspects of the business.
However, he cautioned that a full restructuring or revival of the company appears unlikely without significant external investment.
