I was out at the Aero Club today and got to see a couple of very interesting aircraft!
The first was a Boeing 737-377, ZK-SLA, which is registered to Airwork Flight Operations. It appeared to be on a charter today as it parked on the Eastern Apron and the passengers were transferred to some buses.
The second was a Royal Australian Air Force owned Lockheed P3 Orion [no rego for this one]. I heard it when it was almost overhead, so that's all I got for a picture also.
* Thanks to "Barry" for the update, especially on the RAAF P3 Orion [ see comments for more information]