Comair Flight 5191 crashed while inadvertently attempting to take off from the wrong runway at Blue Grass Airport in Lexington, Kentucky, killing 49 of the 50 people on board, and causing the Federal Aviation Administration to modify air traffic control rules.
South Vietnamese junta leader Nguyễn Khánh entered into a triumvirate power-sharing arrangement with rival generals Trần Thiện Khiêm and Dương Văn Minh, both of whom had been involved in plots to unseat Khánh.
British forces led by William Howe defeated the Continental Army under George Washington at the Battle of Long Island, the largest battle of the American Revolutionary War.