Delta hub, in brief

Answer:

ATL

Hint:

This major airport serves Georgia's capital and is named after a former mayor who helped transform the city. It's also the busiest in the world by passenger traffic.

Explanation:

Delta hub, in brief" refers to Delta Air Lines' main airport hub, which is Hartsfield-Jackson Atlanta International Airport. The clue asks for the airport's three-letter IATA code, a standard shorthand used in aviation. "ATL" is the well-known abbreviation for Atlanta, making it the straightforward answer.

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