Boom has a new design for its XB-1 Supersonic Demonstrator jet, the working prototype aircraft it’s creating to prove out its tech before beginning work on building real, commercial supersonic passenger aircraft. The new design was revealed Tuesday at the Paris Air Show, along with new business milestones: Boom has orders for 76 aircraft thus far, across five airline customers.

That’s a lot of orders booked for an aircraft that doesn’t actually exist yet, from a small startup, but you can tell why airlines are excited. Boom’s promise is one of reducing flight time significantly on popular intercontinental business routes, with economics that will roughly match current business-class fares for travelers while offering sustainable economics for airplane operators at the same time.

The new design of the XB-1 includes refinements that the company says will offer better stability overall for the propulsion system and boost overall safety. Parts for the demonstrator had been undergoing stress testing recently, which has likely helped contribute to these design changes.

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