Concorde last flew in 2003 and then the remaining aircraft were all retired. The laws of physics haven't changed and the flying that fast burns a LOT of fuel. I assume you are referring to this where the next generation of supersonic aircraft is mentioned. I don't think it would be practical to bring back the original plane after being idle for over 22 years. The article title is misleading as the original Concorde is NOT making a comeback. Supersonic passenger flight is really what is being proposed with a newly designed aircraft.
https://euroweeklynews.com/2025/07/07/concorde-is-set-to-make-a-comeback-in-2026/
If the plane is still in development, likely they are being optimistic about when it will actually go into passenger service. Often these types of companies make overly enthusiastic promises and then find the reality of actually building production aircraft is a LOT more complicated than they originally thought, in addition to all of the technical challenges associated with supersonic flight.
A company in the US is also talking of building a supersonic aircraft but hasn't found any company willing to sign on to develop the engines. They claim they will do this on their own but would be an ENORMOUS challenge. I don't think they have ever mentioned when they expect their planes will go into service.
Neither Boeing nor Airbus as far as I know have any current effort underway relating to supersonic aircraft and clearly they have a LOT of technical expertise in building passenger aircraft. That expertise takes YEARS to develop.
