At most U.S. airlines if a flight attendant provides great service it’s because of their own inner drive. It’s not because of any training program or incentives that the company has set up.
One of the most frustrating thing I hear from cabin crew all the time is about the small percentage of their colleagues who are slackers, who perform poorly and do as little work as possible (increasing the workload for everyone else). This is frustrating because there’s usually very little consequence. And seeing poor performers do just as well as those who provide exemplary service is demoralizing.