Stocks Slide as Yields Climb; Spirit Airlines Plunges on Failed Merger
• Wall Street slips as Treasury yields rise; S&P 500 falls 0.4%, Dow drops 0.6%, Nasdaq dips 0.2%
• Spirit Airlines stock plunges 47% after judge blocks merger with JetBlue
• Banks' earnings mixed Morgan Stanley down 4%, Goldman up 0.7%
• Analysts forecast weak S&P 500 profit growth for Q4 but optimism higher for 2024
• Fed's future rate cuts remain key driver of market movements; yields climb after official says policy "set properly"