During sentencing in the Queenstown District Court yesterday, Judge Kevin Phillips said he held concerns about pilots feeling the urgency to keep aircraft moving.
"In my view, there appears to be some degree of either peer pressure or operator pressure to personnel, and I find it alarming that a person as experienced as you has come to need to get this aircraft off the ground, out of Queenstown, in these circumstances," he said.
"If there is the prevalent view among senior pilots that 'the job has got to be done' then that has to be, in my view, denounced."
Gunn's good character from his exemplary 30-year commercial flying career "is now gone forever" because of his wilful disregard for aviation rules, Judge Phillips said.
Gunn took off from Queenstown with 64 passengers and six crew at 5.25pm, 11 minutes after the rules stipulated it was safe to do so.
He was also flying into low cloud and high cross-winds.
During Gunn's trial last year, the prosecution claimed that had there been an engine failure during or immediately after take-off, the plane would not have been able to get safely out of the mountain-surrounded Queenstown basin.
A transcript of an interview with Gunn after the incident showed he regarded flying that day as "just another day in the office".
Judge Phillips found that to be an aggravating comment.
"You seemed to ignore the fact that you had to maintain visibility not only with the lake and the ground below, but also the mountainous terrain you had to fly around.
"Somehow, you as pilot-in-command could make your own rules."
CAA director of civil aviation Graeme Harris welcomed the sentencing.
"While we prefer to work with airlines and pilots that share a common interest in safety, there is a threshold beyond which those involved in aviation must be held accountable for their actions and that is what has happened in this case."
A spokeswoman for Pacific Blue owner Virgin Australia said the company "accepts the decision of the court, however will not be going into further detail".
