Maybe it was running low.... I left myself open for such a response. But as a non pilot, I find it unusual that a relatively fast moving storm cell (7pm weather report shows Sydney now clear) would prompt a diversion rather than holding. I am assuming a 767 would have the endurance to hold for an hour or so and that would be a cheaper and more convenient option than a diversion? I'm just interested in how the industry works both from the cockpit and management point of view and found it interesting as Air NZ don't serve Canberra. Perhaps I should have posted a question rather than an observation, but I was hoping for a bit of education from those far more wise than I...