Indeed, Uman is right... offset is use for model position in space for use in game. It is also not changable in game.
'good' flying enemys would have changing altitudes and to do that you defy gravity and moveup.
Ziz if you want this, you have to be specific. FPSC AI is mearly a programmed series of actions preformed on events. Making enemys fly by turning off gravity and moving them up is the easy part, making them act inteligent and do what you want them to is the harder part.
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I believe society is flawed; our notions on life, on child rearing, stem too far back to be of relevance in this day and time.