Originally Posted by cavemanzk

Under current New Zealand Law, only flights over 90 seats are required to be screen anything less than 90 seats is optional. They looked at it a couple of years back, and NZ decided the cost out weighted the risk. Back in 2001 no domestic flights had screening at all, you used to just walk straight from check-in to the plane.

Most regional airports, are still just an tin shed. So to setup any form of screening, the cost would be huge.