Competition isn't the reason for the capacity increase - the demand for seats on that route is just SO huge over that Xmas period that the extra seats are needed.
Here's the exact flight details.
NZ547 AKL 1700 CHC 1820
NZ548 CHC 1905 AKL 2025
are operating as 762 from 23/12 until 05/01.
Nice to see NZers getting behind the flag carrier
Loads are very very positive right now and expansion in the near future is planned.