Delta will increase flying from its Atlanta hub by nearly 75 flights per day next summer, bringing its average daily flight count to 968.
The increase means Delta will fly a record number of seats from Atlanta next summer, eclipsing its previous mark in 2019.
All told, Delta will serve 215 destinations from Atlanta in summer 2025, offering approximately 1.1 million weekly seats. Those will include 66 international destinations, including new routes from Atlanta to Brussels and Italian city Naples.
The increase comes as Southwest, Atlanta's second-largest carrier, reduces service at the airport.
For the 12 months that ended in June (the most recent data from the Bureau of Transportation Statistics) Delta mainline and regional flights accounted for more than 76% of enplaned passengers in Atlanta. Southwest was a distant second at 9.3%.
In April and May, Southwest plans to reduce Atlanta departures by approximately one-third to focus on better-performing routes.
"Booking patterns simply don't support continuing our previous levels of service in Atlanta," Southwest said.
Southwest's biggest service increases next spring will be in Nashville, Phoenix, Las Vegas, Burbank and Sacramento, according to an analysis by Deutsche Bank.