Each agent who sells insurance gets a bonus. They also have to meet their % goals (ie 80% upsell). This is called SRPD or something like that. They can make it off PDW, LDW, or FPO (Fuel Purchase Option).
When a branch does well, the manager (salary position) gets a branch bonus. They also look at metrics such as NPS (Net Promoter Score, ie Surveys), revenue growth, fleet growth and etc.
This is only for HLE. Not sure about unionized airport workers.