For now this is just a design proposal, far from a fully functioning engine and coming from partners that have never built a single engine ever. Who is actually going to built that engine ?
We all know how extremely complex it is to build an normal engine ( non supersonic) that can fufill all it design promises; can you say the Silvercrest from Safran ? It was announced in 2006 and It still doesn't work properly and Dassault and Cessna cancel their contract. So Safran has an engine not fully functional with no clients and millions spends.
Now let say they can make it work in that super short delay ( nearly impossible) and can find a supplier who want to build it (who ? Where ? Every engine builder said they where not interested in the project .) with only one client : Boom ( how can you make a profit ?) and for the sake of discussion that the working engine is a little bigger , a little longer and little heavier than the proposed concept ?
Well that going to affect the center of gravity , the airflow, the aerodynamic ,the pylons design ,the lift and the total weight of the aircraft just to name a few items. Yet Boom tell us they have the final design of the aircraft competed. How can you have a final design if you don't have a working engine ? They are supposed to fly a baby boom overture ( XB-1 ) with a old GE J85 engine (fist flight :1960) for a few year now , yet it still hasn't flown a single time ,why ?
I have yet to see a suppliers list for the parts ( or sub assembly )for the aircraft (landing gear , aviation suite, electronics etc) yet there telling us there going to do a first fight in 4 years and Full FAA,EASA ,TCA etc in 2029?
Coming from a new company that has never built a single aircraft ever with new employees (where are they going to find the workers ?, everybody in the industry is short staff ) , the learning curve etc ? We all know how complex it is to bring a brand new aircraft to EIS from the big names , and they are always late and over budget. just to name a few; Boeing 787 (cost : 32 billions ) Airbus A400M (31 billions ) Bombardier Cseries ( now Airbus A220) nearly bankrupted the company that gave it away to Airbus for $ 1 dollar.
How much it going to cost to Boom to bring a SUPERSONIC aircraft and get it certified by all governing bodies ? Remember the problems of certification of Mitsubishi and the MRJ ? Never got certified by the way and the project will be cancelled ( technically on hold indefinitely for now but just still not announced officially )
How much money does Boom got into his bank account ? A few hundered millions ? that just a FEW of the problems I see that they need to solved to make it ( I could name a few promises that are , hmm.... how can I put it ? overly optimistic, a few flight projections are not achievable , and some pair cities would never have enough clients to make it economically viable. ) Sorry but for me, that project sound more like Elisabeth Holmes Theranos than anything else.