for international flights I just check a few webpages (expedia, opodo, etc.) just to get an idea of what is available, what airlines have good fares, etc. But they are useless if you want to book sitting in NZ
. My best experience really is FlightCentre. Usually the guys are friendly and efficient, and they dig out great deals. Only drawback with them is that they are extremely busy most of the time, and thus it can take a bit to get a reply, or until it's your turn if you go to their shops. But for the service and good fares they offer that is a minor issue...
Personally, I am always frustrated that there are no good Internet booking sites here in NZ
Canada and in Europe it was so much easier - I booked everything online. And in NZ
it works the same for domestic flights, or trans-tasman, but not for long haul...