Southwest Airlines is planning to cut about one-third of its flights in Atlanta next year to save money, and employees affected by the change are furious.

The changes come a day before Southwest's investor day, when executives will map out the company's plan to cut costs and grow revenue.

Southwest Airlines Co. is ending nearly a third of its flights through Atlanta in an effort to eliminate unprofitable routes, the latest move by the carrier to improve operations amid pressure from an activist investor.