Air New Zealand and the Department of Conservation have announced a new three-year partnership.
Prime Minister John Key and Air New Zealand chief executive Rob Fyfe announced the deal, worth the equivalent of a million dollars a year to DOC, in Auckland on Friday.
Air New Zealand will provide travel and marketing support for programmes connected to the National Parks Great Walks network.
It will also help promote the nine Great Walks, including the Milford, Heaphy and Abel Tasman tracks.
Mr Fyfe says the partnership will enable important conservation biodiversity projects to take place.
The airline will also transport threatened species to safe breeding sites around the country, as part of DOC's active recovery programmes.