Atlanta has how many runways???? New Orleans has 2. Atlanta severest about 100,000,000 passengers a year....New Orleans around 10% of that. The logistics of moving Delta’s largest hub doesn’t compare to landing Amazon’s second HQ. New Orleans may be capable of handling a minor airlines secondary hub.....Delta’s primary in your dreams.
NOLA might not be able to handle Delta but cities like Chicago, LA or DFW could and would find the money to make it happen if they thought Delta wanted to move.
As Pres. Eisenhower said, "I don't know if I'm going to heaven or hell, but I do know I'm going through Atlanta to get there."