The Southwest Airlines flight 424, from Baltimore/Washington International Thurgood Marshall Airport to Chicago Midway International Airport, had to divert and land in emergency at Port Columbus International Airport, Ohio, at 2 a.m. Central Time on July 23.
The pilot decided to make an emergency landing after there was an indication of smoke in the forward cargo hold.
The plane landed safely and slides were used to evacuate the 49 passengers on board. No one was hurt.
The National Transportation Safety Board is investigating. Southwest Airlines has declared the plane out of service for inspection.
An alternate was flight arranged for taking the passengers to their destination.