Speed and Sharpness are your allies in aerial combat, although melee tactics will give way to maneuvering.
In an answer about Martial Arts in microgravity I spoke about hold techniques, and if you're talking about unarmed low gravity combat, I still maintain this is the best solution.
In an aerial environment however, it is better to look at birds as your closest analogue. Hunting birds have two traits that make them successful in that regard; speed and sharp talons & beaks.
Ultimately, momentum (which is going to have the greatest impact on your enemy) is made up of two components - mass and velocity. Birds are low in mass by design, although birds like eagles and falcons are larger than the prey they hunt, but for combat purposes the way they increase the impact of their collision with each other is through speed. The faster you're going, the more impact your existing mass will have on your opponent.
Of course, to maximise the benefit of that impact however, you want that impact to inflict the most damage and that means razor sharp beaks and claws, effectively working like daggers. These require only a small amount of momentum to do piercing damage, thus wringing every drop of damage out of the momentum they are capable of building up.
In such a situation, you won't be dealing with birds trying to hover in mid air and fight each other so much as swooping each other from above (falling maximises speed and therefore momentum) or at the very least, trying to get around the opponent to strike a weak point. Most aerial bird fights are dogfights, not melee actions.
Of course, it's important to point out that birds fight this way because they are in a gravity well and their wings are designed to interact with the air in a manner that supports their mode of flight and their ability to turn quickly in the atmosphere. In a zero gravity environment, birds would be as lost as we would be in terms of their instinctive fighting techniques.
To that end, the answer above should be read as how winged creatures in a full gravity environment would fight; the linked answer would still hold valid (wings or not) for those fighting hand to hand in a zero gravity or micro-gravity environment.