A Southwest Airlines flight from Nashville to Fort Lauderdale made an emergency landing in Atlanta late Friday after a reported security threat onboard. The crew diverted the aircraft as a precaution, and law enforcement officers boarded the plane upon landing. One passenger was escorted off the flight without incident, and no injuries were reported. The FBI has launched an investigation to determine what prompted the security concern and whether any charges will be filed. Passengers described the situation as tense but orderly, praising the crew for remaining calm and following safety procedures that ensured everyone on board reached the ground safely.