We check this website, now christchurch-airport.co.nz is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is christchurch-airport Down Right Now? - NO! christchurch-airport is up!
If you have problem with access to site christchurch-airport, and domain christchurch-airport.co.nz is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).