In this April 1, 2020, file photo, several dozen Delta Air Lines jets are parked at Kansas City International Airport in Kansas City, Mo. Delta is backtracking slightly on changes it previously announced in its frequent-flyer program, but it still plans to reshape SkyMiles to favor big spenders over customers who take the most flights. Delta outlined the revisions in an email from CEO Ed Bastian to SkyMiles members on Wednesday, Oct. 18, 2023. (AP Photo/Charlie Riedel, File)