Well, in current game rules you can't maintain fighters which was my primary question. I don't believe I've ever put anything other than 500 or 1000 ton ships in hangers. In my current game I have 80 FACs in hangers and isn't really saving me a whole lot in maintenance compared to the cost of building a PDC capable of holding them all. Though if someone instead built a 80,000 ton ship and put it in a hanger...
Maybe a new installation that allows only fighters (maybe FACs) to be hangered on planet.