[nostrademons]

They've got LOIs for 76 aircraft @ $200M/plane from 5 airlines:

https://www.flightglobal.com/news/articles/analysis-jal-inve...

There's certainly both technical & market risk, because an LOI != cash in the bank. But that's why investors are willing to invest. If Boom delivers on its technical promises to spec, that $15.2B in revenue lined up before the first prototype flies.

[notahacker]

It's not $15B lined up before the first prototype flies, it's $15B that might happen, eventually, after Boom has delivered on its technical promises by flying and certifying the airframe, if the airlines at that stage decide the finished article fits with their operations at that time, they're happy with the operational risk and they can raise the capital to finance the aircraft acquisitions on adequate terms.

JAL putting in $10m of seed investment is showing a bit of faith, but the rest is just pieces of paper.

Concorde had firmer commitments for 74 aircraft back in the day, but only ever made 20, most of which were sold off at a subsidised price and spent most of their time on the ground.