Air New Zealand

The airline has been operating a second flight only during the high season and was due to return to the twice weekly flights from the end of this month.

The Secretary to the Niue government Richard Hipa said Niue had signed an air services agreement with the airline for the second flight to continue through the low season.

"It's good news for us and we just hope there'll be bums on seats to make it economical."

An employment lawyer says the images could bring the airline into "disrepute", and may amount to serious misconduct.

The photos show a pilot posing with a blow-up doll inside an aircraft. It is understood the images were shared to Facebook and Instagram.

Another video, which appears to have been posted to Snapchat, shows a flight attendant moving through the cabin, spitting water.

The video is captioned: "Wish I could spit on passengers like this".

An Air New Zealand spokeswoman said the airline was "shocked and appalled" by the images.