My understanding is that 3-D printing is still only optimal for prototyping. Once you get into production of any size, traditional methods are much cheaper per unit.
The point is that the spare parts you need can be made with traditional manufacturing processes because that's how the original was done. Just because you only need one, doesn't necessarily make it easier to produce by a 3D printing machine.
That was about a decade ago, so I'm sure they've moved onto more exciting things.
I'd say if you make a factory that takes raw materials and creates a series of one-off items, that you are engaging in production.
It seems like what you're really saying is, "this is not how production has been done in the past". With 3-D printing and related automation technologies, this will start to change very quickly. (It's already started, in fact).