The FAA's emphasis on permanent inspectors at Boeing suggests a move towards tighter regulatory oversight. This could result in increased operational costs for Boeing as they may need to invest more in compliance measures. The heightened scrutiny could also impact investor sentiment negatively in the short term.

The specific mention of Spirit AeroSystems by the FAA for the requirement of permanent inspectors signals a direct impact on the company's operations. This could lead to increased costs related to compliance and operational adjustments. While aimed at enhancing safety, this move could initially be viewed negatively by investors due to the potential for increased expenses and operational disruptions.

While the FAA's actions are directly targeted at Boeing and Spirit AeroSystems, the broader implications for the aerospace sector could have a ripple effect on the overall market. As SPY is a broad market ETF, any significant shifts in aerospace industry sentiment or regulatory impacts could indirectly influence SPY's performance. However, given the diversified nature of SPY, the impact is likely to be more muted compared to the direct effects on Boeing and Spirit AeroSystems.