Boom Supersonic to Launch Symphony Engine Testing at Colorado Air and Space Port

Adams County and Colorado Air and Space Port (CASP) announce a major milestone in aerospace development as Boom Supersonic has selected CASP as the site of its Symphony engine test facility. The company will repurpose a former hypersonic testing site at CASP for development of Symphony, the bespoke propulsion system for its supersonic airliner, Overture.

“This is an exciting moment not just for Adams County but for the future of aerospace innovation in Colorado,” said Lynn Baca, Chair of the Adams County Board of Commissioners. “Boom’s investment in our community puts us at the forefront of the aerospace industry and reflects our shared commitment to advancing next-generation transportation technologies.”

Boom plans to invest $3-5 million into the site in 2025 to prepare for prototype engine core testing later this year. The Symphony test facility at CASP near Watkins, located just 35 miles from Boom’s Denver headquarters, will feature advanced instrumentation and data collection systems to support rapid engine development and refinement.

“We are very excited to welcome Boom Supersonic to Colorado Air and Space Port and to support the development of its revolutionary Symphony Engine,” said Jeff Kloska, Director of CASP. “We look forward to a great partnership with Boom and to advancing our aviation and aerospace ecosystem at CASP.”

The Symphony Engine core is a 12-foot-long, four-foot-diameter high-pressure spool comprising the high-pressure compressor, combustor, and turbine. Testing at CASP will generate critical engineering data to support the development of the full-scale Symphony turbofan in 2026.

Symphony is the first jet engine developed independently for supersonic commercial flight and is designed to enable “Boomless Cruise”—supersonic speeds without a ground-detectable sonic boom. This innovation could open the door to overland supersonic travel for the first time.

“Symphony is rapidly advancing from concept to reality. By leveraging an existing site, Boom will have the first independently-owned supersonic engine test facility for less than it would have cost to rent a government facility,” said Blake Scholl, Founder and CEO of Boom Supersonic. “By vertically integrating propulsion, we are able to accelerate development, reduce costs, and custom-tailor an engine for Overture—unlocking capabilities like Boomless Cruise.”

Boom’s Overture aircraft currently has 130 orders and pre-orders from major carriers including United Airlines, American Airlines, and Japan Airlines. Symphony production will ultimately take place at StandardAero in San Antonio, Texas, while CASP remains the hub for engine innovation and testing.