i don't know if the collision model has been tweaked, or of it's something about better detection, or even possibly with the new changes to your field of view it's changed how you perceive the closeness of other planes. Last night I collided 3 times... twice in one sortie (first took off the end of my wing, second took out the back half of the plane as I was trying to limp back to base). I very rarely collide, but I really think it's because we're all adjusting to a new depth percetption that we might be getting closer than we normally would have in the past.