Don't forget that you'd probably be able to have ships in orbit too. Their sensors are going to be much more powerful than anything you can fit on a fighter.
And Jorgen, you don't need to see where the attack starts; if you see where it is and where it's going, you can easily trace it back to the source. And as for missiles, even a ship with no sensors whatsoever (and therefore relying on the default thermal sensors) can detect a missile just before it hits the ship, right? Since the minimum range is 10k km, that presumable means it's detected somewhere between 10k and 0 km. Earth's atmosphere is only 100km thick (approximately). Presumably, most combats will be taking place on similar worlds. So, your ships will always be well within range to spot missiles being fired at aircraft. And atmosphere no longer affects beam weapons, so shipboard point defence can be used to protect fighters against SAMs. Therefore, it seems likely that SAMs in the Aurora universe would be a pretty inefficient way to fight. So, AA beam weapons would probably be the major way of fighting.
Or would they? Again, passive sensors could be used to spot the gunfire, and trace it back to the source. And energy weapons are no longer affected by atmosphere, so why not use targeted orbital bombardment to knock out enemy AA?
Incidentally, Steve, I hope manual targeting of orbital bombardment will be a thing? So you can set each FC to target a different ground formation, exactly like space combat (plus maybe an option for "general targeting, where they just shoot at a random formation)? And, presumably, from that point it works like ground based artillery bombardment?
Just a suggestion.