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The tool allows people who hold credit directly with the airline to manage their credits online.
About $1.4 million has been redeemed and about 38,000 customers used the tool to look up their credit balance.
The company also extended the period for using the credits - people now have until December 31, 2021, to book, or 12 months after booking to travel.
Air New Zealand's Cam Wallace said: "We know it's been tough for customers trying to get through to our contact centre, but with this tool now being live, it gives customers a choice as to whether they would like to use self-service or speak to an Air New Zealand employee."
The airline said it was working to improve the tool.