system
Given the following post, respond as if you're commenting on Reddit:
human
[Terminator Salvation] How does the resistance maintain large bases and airfields with a fully functional A-10 squadron and still remain hidden from Skynet?

It would seem like skynet, with it's access to airborne HK units and satellites would be able to detect these bases very easily.
gpt
The resistance actually hold territory. Assumptively, SkyNet doesn't have the conventional force of arms to challenge the bigger resistance holdings, especially if they're further away from SkyNet's own power base (namely its factories); it also seem to have ran out of nukes. Not quite sure why it wouldn't just smother the place with conventional missiles, though, perhaps SkyNet's aerospace industry is not large enough to build both HK aerodrones and missiles, especially if the missiles are of very narrow use.

Conversely, the big resistance based are a huge investment and must be additionally protected by distance, which constrains their usefulness to the resistance. I'd expect dedicated air defence for the bases as well, because the A-10 is technologically antithetical air defence, and the pilots in Salvation clearly weren't ready for a basic 2-on-1.