What else happened on Valentines day in history?

Valentine's Day, celebrated on February 14, has seen various significant events throughout history. In 1929, the infamous Saint Valentine’s Day Massacre occurred in Chicago, where seven members of the North Side Gang were killed during a turf war. Additionally, in 1967, the first Boeing 737 made its maiden flight, marking a significant development in aviation history. These events highlight how the day is marked by both romantic and notable historical occurrences.