Lead Balloon,
Airservices has a Board, see here for details <https://www.airservicesaustralia.com/about/our-governance/our-board/>
Boards do not get bonuses, contracted managers do, supposedly tied to "performance".
Targets are set each year (I think though it should be longer) and if you meet the target the CEO decides how much of the bonus you get.
It is however a flawed concept, particularly in the Public Service where performance is not very important, because the manager then concentrates on whatever generates the bonus instead of other "non-bonus attracting" activities.
From an online document <https://hbr.org/2016/02/stop-paying-executives-for-performance>
"As the incoming Chief Executive of Deutsche Bank, John Cryan,
recently said in an interview: “I have no idea why I was offered a contract with a bonus in it because I promise you I will not work any harder or any less hard in any year, in any day because someone is going to pay me more or less."