Paul is correct, simply follow the car rental signs to Budget at the airport. That was a very nice and detailed response. Great work Paul!
"Return your Budget rental car to the Atlanta airport rental car center located at 2300 Rental Car Center Pkwy, College Park, GA, 30337. Most drivers will approach from Crosswind Rd. As you approach the airport area, you’ll follow signs for the Rental Car Center." Via https://www.budget.com/en/locations/us/ga/college-park/atl From there you ride an elevated tram to the airport. It is efficient.
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