Delta also has removed all glassware, including champagne flutes and coffee mugs, from first class and business class. And it has suspended hot towel service.
The airline also said it is "evaluating adjustments for long-haul international flying."
Workers for airline catering contractors are being affected. Gate Gourmet Inc. disclosed cuts affecting 500 workers in Atlanta as of March 25, according to a state Department of Labor business layoff and closure listing.
Passengers can bring their own food and beverages on board. However, travelers cannot bring any alcohol to drink on board a flight, according to federal regulations.
Also, many concessions at Atlanta's Hartsfield-Jackson International Airport have closed amid decreased traffic at the world's busiest airport.
Concessions will be concentrated at the centerpoint of each concourse, with the aim of keeping at least one restaurant and shop open on each concourse.
Travelers can bring solid food items through security checkpoints, as long as they are not liquids or gels, according to Transportation Security Administration regulations.
Delta is also closing some of its Sky Clubs and discontinuing shower service at airports. At Hartsfield-Jackson, Delta said it currently has clubs open on Concourses T, A, B and F.