In the No. 1 spot was Southwest Airlines, the second-largest carrier at Hartsfield-Jackson International Airport. For Southwest, 100 percent of queries yielded award seats in the survey.
In the No. 2 spot was JetBlue Airways, which launched service to Atlanta this year with a route to Boston.
The list included other big U.S. carriers, including United in 13th place and American in 18th place.
The survey is based on 7,420 booking and fare queries made on airline frequent flier websites in March 2017.
According to IdeaWorksCompany, frequent fliers are “better served by the reward programs at value-oriented airlines.”
Airlines know “that nothing can match the allure of a practically free fight to an exotic destination,” according to the report. “This survey provides proof that some airlines deliver this promise much better than others.”