The AJC reported Southwest had been operating 34 737 Max 8s, including some flights from Atlanta.
American Airlines used the Max 8 as well, though none of its Max 8s are used on flights to or from Atlanta. United Airlines operated the Max 9.
On Tuesday, the FAA chief said a review of 737 data "(showed) no systematic performance issues and (provided) no basis to order grounding aircraft."
In the FAA announcement, the agency cited "new information" from its investigation of the Ethiopian crash that indicated similarities between it and the crash last October.
The agency said these findings “warrant further investigation of the possibility of a shared cause for the two incidents that needs to be better understood and addressed.”