American Airlines stock tumbles after cutting Q2 guidance Yahoo FinanceAmerican shares tumble 15% after sales strategy backfires; carrier cuts growth CNBCAmerican Airlines drops its upbeat profit guidance, and stock drops 8% MarketWatchAmerican Airlines Slashes Outlook; AAL Stock Tumbles Investor’s Business DailyAmerican Airlines cuts some 2Q financial forecasts, says chief commercial officer is leaving ABC News