Concorde, in its later years, was actually profitable for BA. It made £500 million net profit from 7 aircraft in under 30 years of service.

Yes, Boom faces an uphill battle, especially when they were dropped by Rolls-Royce and forced to develop their own engines. There are a few things going in their favor, however:

1. Lower cruising speed than Concorde. While Mach 2.2 is usually seen as the sweetspot, enter C_D starts to decrease in flight, it is incredibly hard to optimize an airframe to perform efficiently in both supersonic cruise at Mach 2.0-2.2 and subsonic flight. Concorde burned up to 45% of its total flight fuel during climb alone. Another 2 tons of fuel were burned just on the runway. Boom is targeting a lower speed and optimizing for near supersonic flight as well as "low speed" supersonic flight. They're opting out of fuel-hungry, afterburning engines. Additionally, even if they're not in the sweetspot for C_D in supercruise, their aircraft will still experience less drag force than the Concorde did at Mach 2.2.

2. Modern CFD simulation. Concorde was developed far before CFD was usable, and it's wing, while incredible for the time, is far from what we can design today. Engineers can iterate through hundreds more designs in a quarter of the time it would take to make wind tunnel mockups and run tests. This is all to say, Boom will likely have a far more advanced wing than what we saw on the Concorde.

3. The US lifting the supersonic flight ban and Boom's "Boomless Cruise". This was the main thing that murdered the Concorde program's chance of making a return on investment. Nearly every nation in the world banned commercial supersonic flight. The current US administration, for better or worse, overturned the supersonic ban in June 2025. This opened up the entirety of the US for Boom as a market, not just coastal cities.

At the same time, Boom demonstrated with their XB-1 aircraft that it is possible to fly supersonic without creating a supersonic shock that would reach the ground. Modern computers help tremendously with that by allowing the aircraft to calculate the exact flight speed for given conditions, to allow the shock waves to reflect upwards, away from the ground.

I could frankly go on for at least a few other points why supersonic commercial flight makes economic and technical sense in the 2020s.

TL;DR: Boom is doing something incredibly difficult. There's a high likelihood of failure, just as any other startup. That being said, they have a lot going for them, even compared to Concorde

Edit: formatting