May I assure you there's no lecturing involved with my post. And I'm mindful of the pilot's point of view. But as with so many other things, if we don't all play the game together we aren't going to get very far. -5 and +10 are tight enough buffers as it is; there won't BE that leeway in a couple of years when the slot time MEANS the slot time, with no -5/+10 or anything else. (Last I heard, it'd due to come down to -2/+5; the timing I'll have to investigate).