Many airlines had major maintenance bases at hubs, but many also have chosen to locate them elsewhere (American in Ft. Worth and Tulsa, British Airways in Cardiff and Glasgow, Northwest in Duluth, etc.). Aside from tax or other local incentives, what operational benefits are there to locating maintenance 'away from home'?
Costs of Rentals in certain airports/airfields are cheaper than other more popular ones.
The smaller Airports are at times having less traffic & not much noise restrictions as in the major ones.....making Mx tests easier & cheaper.
Surrounding area Real estate prices matter too.
I may not win often, but I damn well never lose!!!