[Gammix]

Use (Col/Map)Andreas to check the Z height difference. If there is a significant difference, then yes the point is in air.

pawn Код:

public OnFilterScriptInit()
{
    CA_Init();

    return 1;
}

IsXYZinAir(Float:x, Float:y, Float:z)
{
    new Float:CA_z;
    CA_FindZ_For2DCoord(x, y, CA_z);

    return ((-(CA_z - z) * -1) >= 1.0) ? (true) : (false);
}