This is for arrivals only, not departures. Can the tower controllers give heading/course instructions that don't reference a runway? Of course, duuhhhh the goal is to land on a runway. But during a recent arrival I felt if the tower had plane to fly a specific course and then enter downwind it would have avoided some hassles between other planes arriving at the same time. But that hypothetical instruction probably would not have referenced a runway. I'm trying to think back and it seems that every instruction given for arrivals always reference a runway. Is this a requirement? Can a class Delta tower controller tell an arriving aircraft to fly a specific course? Can they instruct them to do 360's that aren't specific to downwind or base?. Can they instruct you to fly to some other part of their airspace and do turns, etc? Or are they required to always reference the runway(s)?