[notahacker]

In the scope of aerospace $100m is pocket money.

It's the lack of fuel efficiency which has killed off various other exploratory supersonic flight programmes from ever going anywhere. Ultimately to be successful they have to convince airlines the extra speed will convince passengers to pay for the extra fuel. I think that's unlikely in the near future, and Boom will have to raise a lot more to convince people otherwise.

[astrodust]

It's not pocket money, it's pocket lint.

[colechristensen]

It is on the order of the cost of a single aircraft.

Comparable would be Tesla raising $100,000

[FireBeyond]

Minus R&D, facilities build out.

And even then we're still talking a smaller body - 737, 757, not so much a 777/787.

[ryacko]

Single aircraft plus development costs.