Air New Zealand is planning to retire the Boeing 737 from its fleet in September 2015.
The airline has a long history of operating the type, with the introduction of the first 737-200 in 1968. Since then it has operated a sizable fleet of 737-300s on domestic and international flights.
Now, according to WorldAirlineNews, the type is to be retired on 6th September, with the final service being NZ557 from Auckland to Christchurch.
This is subject to change, but not change by much as Air New Zealand focuses on its Airbus A320 fleet.