Re: 'Software delivered to Boeing'
if they do, they aren't required to take the lowest bid.
Required? No. Will they though? Yes almost certainly
Most projects that I've seen fail or wind up being a sub-par mess was due to (project) management wanting to either deliver under budget or to meet arbitrary deadlines.
Usually involving bonuses for delivering under budget / on time.
As long as the incentives are incorrect, these things will happen.