By Shaddi Abusaid From The Atlanta Journal-Constitution ATLANTA—A Delta Air Lines flight bound for Atlanta had to make an emergency landing Friday evening when an unruly passenger attacked two flight attendants and threatened to bring down the plane, authorities said. The incident occurred on Flight 1730, which took off from Los Angeles but had to be diverted to Oklahoma City, Delta confirmed Saturday morning. Oklahoma City police said a man became unruly, made terroristic threats and assaulted two flight attendants near the front of the plane. Crew members asked passengers for help, and several people detained the man with the help of an off-duty pilot, an agency spokesman said. One passenger said the man attempted to open the cabin door midflight, but a Delta spokesman told The Atlanta Journal-Constitution that was not the case. Police said the man exhibited “signs of mental health issues.” He was taken to an Oklahoma City …