Here is a comparison of United and Delta's 757 fleets and their seating configurations. While United and Delta are the two largest 757 operators, they are not the only operators of passenger 757s.
amounting to over 8.7 million Available Seat Miles (ASMs). Topping our list of Delta's routes with the most 757-300 flights is the 1,891-mile route between ATL and San Diego International Airport ...