Not a lot to go on here. Boom projects first flight in 2026 for the Overture. They seem to be fairly close to first flight with their XB-1, but it has not flown yet. I congratulate them on getting funding, but all the hard parts are ahead.
https://interestingengineering.com/culture/boom-xb1-superson...
https://www.denverpost.com/2017/06/20/centennial-boom-supers...
https://www.flightglobal.com/strategy/paris-boom-xb-1-schedu...
Overture is a production model for commercial operations.
It must be less efficient than a winged flyer - even a fast one like boom's, because it won't need so much energy to get out of the atmosphere like a starship has, right? I want starship to succeed but I'm guessing it will be so much more expensive and risky.
The main issue is that their production aircraft will need more powerful engines, and modern civilian airliner engines have large fans, high bypass ratios, and high compression ratios, all of which make them difficult to adapt to supersonic flight. It looks like their plan is to collaborate with Rolls-Royce to build a suitable engine using an existing engine core. I hope they can pull it off.