attacks of opportunity in Flight

[Malakav]

i have been wondering about combat rules in flight

[PC][NPC]

lets supose those are characters at ground level

[PC]

[NPC]

here the PC used Flight Hex and rose up 10 ft

would the NPC Have an AoO?

would normal AoO rules apply in the air? (assuming both characters can fly and are in adjacent squares in the air)

[Malakav]

another question: do normal combat rules apply on flight?

[David_Bross]

If you leave a threatened square, you provoke.

[Nefreet]

When using flight (or swimming underwater) just convert your usual 2D combat tactics to 3D.

A medium-sized creature, which usually takes up a 5 foot square, now instead takes up a 5 foot cube.

A large-sized creature would take up a 10 foot cube, a huge-sized creature a 15 foot cube, and so on.

If you can get past that image (some can, some can't), all the nuances of combat, including attacks of opportunity, will fall into place.