The RadarBox client application will always look at this database for aircraft details first and only if the details cannot be found there it will try to retrieve data from the GAS central servers.
Presumably you mean that the RadarBox client application will:
a) interrogate the user-maintained database
b) if no data found in (a), interrogate the AirNav server (as at present)
c) if no data found in (b), interrogate GAS (as at present)
Or is your omission of any reference to step (b) significant ?