Investors who owned stocks in the last three years have generally experienced some big gains. In fact, the SPDR S&P 500 (NYSE: SPY) total return since May 22, 2017 is 61%. On that day in history, Malaysian carrier Malindo Air flew the world’s first Boeing Co (NYSE: BA) 737 Max commercial flight. Boeing’s 737 Max Headache: Boeing investors had high hopes for the 737 Max, but it didn’t take long for red flags to appear.