Pacific Blue is challenging Air New Zealand to provide data of how many of its flights have been on time for the entire year.
Air New Zealand has urged competitors to issue their figures for the past month, when it reported 86% of its flights were on time. It says the data will be regularly issued to the stock exchange in future.
Pacific Blue says its on-time record for July was just over 90%.
The airline says it discussed the idea of releasing data with other operators last year, but it was rejected.
It says New Zealand should adopt an Australian model where such data is monitored by the Government.
Jetstar plans to start issuing its figures next week.