Method A: The Hunter
This first tactic is fitting for small attack craft and fighter planes, such as the Hell Blade or Dakka Jet. The key behind this is your angle of attack and your target.
Method B: Rapid insertion
Monstrous creatures can change to the jump type, and subsequently assault on its own accord. The flyer can then provide fire support, before zooming off (if it survives).
Another key element of this tactic is a good unit to transport. A heavy assault unit such as terminators, or a good shooting unit is key for this tactic.
Method C: Anti Flyer
When thinking about movement, try getting to the side or rear of your enemy, for two reasons. First off, like artillery, flyers tend to have weak rear armour. Secondly, guns on a flyer are, in most cases, fixed, meaning they cannot shoot you back due to their limited arc of fire.
Also, flyers are less mobile, and in most cases can only make a single 90* turn, meaning they probably can't you you in their line of sight. Stick behind them to deny them a counter attack. Watch out for flyers with the Vector Dancer rule, as they can make a further turn after moving. Also be aware of flying monstrous creatures, as they have a 360* arc of fire, thus ruining the 'stay behind' tactic.
With any luck, and the right flyer, you to can harness the potential of air assaults and conquer the skies as much as the land.