A soldier in an army, or a guard defending a city, the Aerial Combatant specializes in Aerial combat, and riding winged creatures, such as Griffons, Hippogriffs, etc...
Aerial Combatants specialize in the riding of exotic, winged creatures. As such, they are trained in their handling and care. An Aerial Combatant can double their proficiency for any animal handling check to calm a winged mount, and any animal handling, acrobatics, and athletics check they make while riding one.
Aerial Combatants are extremely attached to their mounts, and share a close bond with them. Their mount is not a beast of burden, but a companion, friend, or even family to them.