Wingnutt's right. Compared to real life, visibility of other aircraft in-game is subpar, especially close to the ground or water. Granted, camouflage should reduce initial detection @ range, but @ 200 yds? That's rediculous.
Sure, you can turn up the Gamma, but that's a crutch. That's like saying I should use night vision gear to see better in the middle of the day. Shouldn't have to. And I don't recall him saying anything about not seeing the P-40 icon. He was talking about the plane itself. As far as colliding, I'm sure he would have pulled the trigger sooner and evaded the P-40 if he'd been able to see it sooner.
Frankly I think the problem is too little reflectivity. Even aircraft painted with flat paint should have a certain sheen to them. The ones in-game don't.