This is the same for AA. We can DTZ, but rarely is there ever adequate reserve coverage. I imagine being *allowed* to drop to zero exists pretty much everywhere, but whether you can do it in practice is the rub. I last did it back in March, but since then I've only been able to drop a trip or two per month - never all of it. The question I have is that clearly NK is still covering their schedule with these grid rules - are they just carrying far more reserves than everyone else? How does it work?