The worst service I ever saw was from ASA in both Atlanta and outstations. One of the reasons Delta purchased ASA was they were consistantly last in almost every passenger service standard year after year. The purchase was supposed to improve the service standard at ASA. Sadly Delta management failed to make any meaningful improvements. I remember in the late 90's the big joke was how beyond awful the customer service and agents were in ATL for ASA. Sadly Delta mostly just rehired the same people when they took over the operation and the result is mostly just the same.