Station of the Raven II:
When you see ravens interacting in large groups you are probably observing a gang of juveniles who have not yet paired up. Young ravens court intensely, beginning at age six months, but they will not select a mate until they are three years old. In that time they develop and display skills that will demonstrate their suitability to be a good partner.
Aerial displays are important to show off strong flying skills to potential mates. Often in courtship, two ravens will fly together, perhaps with one of the birds flying upside down.
Bringing food to the desired female in courtship shows that the male will be a good provider when she is dependent on him for food during nesting. A partner will be carefully chosen, as ravens are true blue and generally mate for life.