It's very hard to get on some flights, some being sold out more than a month in advance.
If you have flights fully booked a month out, you need to fire your revenue management team. You will be leaving money on the table and accepting depressed yields.
As an aside, regardless of whose paint is on the tail, we all have friends flying for the "other" guy or trying to nab that next job. JQ (both jet and prop) bring extra jobs into the New Zealand market and that's got to be a good thing.