Where is Center and why did they remove it?

I am wondering where Center is. I mean it would be cool to have something to contact while flying near an active airport and it would be cool as the controller to know where people fly.

Center was removed in the global update simply because it wouldn’t work with the current set up (it would sort of act as approach because every major airport had a center position). It will be readded and reworked in a future update.