Southwest Airlines is working to stop overbooking flights after an April incident in which a United Airlines passenger who refused to give up his seat was forcibly removed from the aircraft, Southwest’s CEO said Thursday.

The task is becoming easier because lower jet fuel prices are helping the industry’s bottom line, Gary Kelly said during a luncheon at the downtown Atlanta Commerce Club sponsored by the Atlanta Press Club.

“We can afford to take this risk … in terms of lost revenue,” he said.

Kelly,…