Revman2 is right, it's a question of corporate commitment to quality, and whether its just pushed down from the top.
Turns out there is a specific application of ISO 9000 type standards for aerospace that "recognizes the role of regulatory authorities":
Society of Automotive Engineers (SAE)
AS9100: Quality Systems
Aerospace - Model for Quality Assurance in Design,
Development, Production, Installation, and Servicing
NIST GSIG: SAE AS9100: Quality Systems/Aerospace
All this is no panacea though, it's still up to the people involved, and more importantly (as reflected in this thread) the corporate culture -- whether ISO certified or not.