"Delta dominated the survey’s premium segment, earning the top spot in both the first/business class and the premium economy categories. The airline has been investing in its onboard experience, revamping its Premium Select product with more comfortable seats and premium amenity kits. Delta One business class seats are popular for their lie-flat design, comfy bedding, and fully closing doors. The airline is expanding its Delta One offerings on its Airbus A350-900 aircraft, adding more seats to the premium cabin."