If Navair move in, the effect on local operators will largely be dependent on where Navair's source of income comes from. If it is an international school, then one would imagine that Navair is bringing it's own business to somewhere that otherwise wouldn't have it.
The flow on of indirect business to the community would be beneficial to all. That's what the Council would be fishing for.
However, if Navair go into competition with the locals for the local market, then that's another story.