SAI is working on development plans for its Quiet Supersonic Transport as it seeks financial and production partners.
The company says preliminary design work is essentially complete for the low-boom business jet.
"There will be more refinement of the design in Phase 2 that will allow Phase 3 systems development to begin in earnest in 2009," says SAI chief executive Michael Paulson.
Phase 2 will cover more windtunnel testing to improve lift-to-drag ratio while maintaining the QSST's "very low" sonic signature, he says.
Phase 2 work will also include preliminary systems design, cabin interior and cockpit layout refinement.
Source: Flight International