Suspect commercial (sales) departments at Airbus and Boeing make delivery promises without consulting the technical people.
It happens in all the tech industries. I saw it for years in information technology. Salesman's pitch to the customer, "What you want is ambitious but achievable. We can help you to do that."
Salesman's pitch to the techos on returning to base, "Hey guys, drinks are on me, I've got a
huge order. And
Guess What I Sold."
