The build-or-buy debate makes sense with some context: * There's a meaningful market for the components you buy Does Spirit contract out to Airbus and Tupolev

The build-or-buy debate makes sense with some context: * There's a meaningful market for the components you buy Does Spirit contract out to Airbus and Tupolev to build THEIR fuselages too? Are there other companies that could reasonably bid for the 737 contract? It feels like there isn't a real market here; they just divested a captive supplier for paperwork reasons. * The stuff you're buying isn't your core competence Sure: buy the fabric for the seat covers from a supplier. Hell, buy the whole seat. But airframes are sort of Boeing's core competency-- too much of the business rides on them to put them at arm's length.