Boom Technology now plans to fly a supersonic demonstrator for a future Mach 2.2 airliner up to two years late by the end of 2019, says chief executive Blake Scholl.
The XB-1 demonstrator, nicknamed "Baby Boom", was scheduled to achieve first flight in late 2017, but that time line was delayed a year ago to later in 2018.
During an airshow presentation yesterday, Scholl confirmed that the first flight for the XB-1 will be delayed again to 2019.
The entry into service of the M2.2, 55-seat airliner remains set for 2025, despite the new delay, Scholl says.
Boom fell behind schedule by taking more time to optimise the aerodynamics of the XB-1 and switching to a different variant of the GE Aviation J85 engine.
"The big risks in the programme are in the rear-view mirror," Scholl says.
The $200 million airliner is being designed to travel 2.6 times faster than most subsonic jets, but for the same cost per seat mile as a business-class flight.
A future factory operated by Virgin Galactic in California will be sized to build 60 aircraft per year.