A day after the grounding of Boeing 737 Max 8 and Max 9 planes, about 20 flights have been canceled at Hartsfield-Jackson International Airport, according to airport and flight tracking data.

The roughly 20 cancellations amount to less than 1 percent of close to 2,500 flights a day at the Atlanta airport. The cancellations include flights canceled due to weather, maintenance problems or other issues.

Southwest Airlines, which has 737 Max 8 planes in its fleet and is the second-largest carrier in Atlanta, is among the airlines that grounded the 737 Max 8 and Max 9 planes Wednesday afternoon after the Federal Aviation Administration issued an order for the grounding.

Dallas-based Southwest said it canceled 39 Max 8 flights that had been scheduled across the country for Thursday.

Southwest has been coping with other maintenance issues in recent weeks and had the most flight cancellations among airlines across the country Thursday. FlightAware.com showed Southwest canceled more than 320 flights Thursday, including those canceled due to the grounding and for other reasons.

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