Delta Air Lines has extended benefits and added flexibility to its SkyMiles loyalty program. The carrier said it would extend Delta SkyMiles membership and select Delta SkyMiles American Express card benefits further into 2021, not charge fees to change or cancel a domestic award ticket for all SkyMiles members and  eliminate a 72-hours-before-departure deadline to change or cancel a domestic award ticket for all SkyMiles members.  Sandeep Dube, senior vice president – customer engagement and loyalty, said that customers now have even more flexibility for upcoming trips and more time to enjoy benefits when they’re ready to travel again. With the changes, Delta SkyMiles American Express Card members will see select benefits extended through the end of 2021; and Delta Sky Club Memberships that were active as of March 1, 2020, will be extended again for members to use through June 30, 2021.