Moody's said it expected the airline to show a better debt-to-earnings ratio in the coming year as it cuts capital expenditure, though that would not go far enough to push its underlying rating to investment grade, which would require a "significant debt reduction".
Moody's also cited the airline's liquidity as a strength and expects Air New Zealand to generate between $550 million and $600 million in operating cash flow over the coming 12 months.
The carrier, which is 74.7 per cent owned by the Government, could rely on its dominance in the domestic market to support its credit rating, Moody's said.
The 80 per cent of the New Zealand passenger market controlled by Air New Zealand "is the most supportive single factor" of the airline's Ba1 underlying credit rating, it said.
The government ownership bolstered the rating to an investment grade Baa3, as there was implied support if the company fell over.
"The strength of Air New Zealand's market position was shown in its sustained profitability over the past several years (albeit with somewhat weakened profits in the most recent financial year)," Moody's said.
However the reliance on the local market was also a hindrance for the airline, exposing it to weakness in New Zealand's economy, it said.
Air New Zealand expected a $30 million windfall from the Rugby World Cup and at last week's annual meeting said it was still getting bookings from overseas fans. Christchurch game cancellations reduced the original expectation of $40 million.
Air New Zealand shares closed down 2c yesterday at $1.07.