AerCap Holdings N.V. has underperformed the S&P 500, but I maintain a Strong Buy rating due to its undervalued flight equipment and resilient business model. Recent pressures stem from investor sentiment, concerns about aircraft values, and sector rotation into AI and semiconductor names, not from fundamental weakness at AER. AER's Q1 2026 showed 27% GAAP net income growth, 6% lease revenue growth, expanding net spread margin, and improved debt coverage, supporting robust fundamentals.