Seen today - Wednesday the 28th of December - at Nelson Airport by Lord Nelson.
Bombardier CL-600-2B16 Challenger N604AU (c/n 5434) at Nelson 28-12-2016.
This Challenger was first listed on the US register as N322BX with Bombardier followed by N322FX for Flexjet LLC before becoming N604AU for ANZA Aviation LLC of Gahanna, Ohio.
It has been based in Melbourne for some time now and operated by Jetcity on behalf of ANZA.
It's had several visits to NZ - Check them out on the MRC site MRC Here