What began as the world's first aerial crop-dusting operation in the Mississippi Delta in 1925 has survived mergers, recessions and bankruptcy to become a global carrier with 5,000 flights a day.

No oil was visible in the gauge on the right engine’s oil reservoir after a February Delta Air Lines flight filled with smoke during takeoff at Atlanta’s Hartsfield Jackson International Airport, a preliminary report from the National Transportation Safety Board said Wednesday.

A Delta flight that made an emergency landing in Atlanta in February had no visible oil in its right engine, the National Transportation Safety Board announced on Wednesday.