Boeing believes a takeover of Spirit AeroSystems is best for safety and would fund a potential deal with cash and debt rather than stock, Chief Financial Officer Brian West told analysts at the Bank of America Global Industrials Conference. West says Boeing is committed to protecting its investment-grade debt rating. “Boeing, more than 20 years ago, probably got a little too far ahead of itself on the topic of outsourcing,” West says. “We believe, and Spirit believes, that reintegrating these two companies is what’s best for safety and for quality for the aerospace industry.” Shares fall almost 3% in premarket trading.