first regular Electra flight Auckland - Rotorua - Hamilton - Wellington, 1948

the same aircraft mentioned on the FDC in Union Airways days, seen with Mt Maunganui (Tauranga) in the background

A First Day Cover issued on 27 September 1948 to mark this event in the history of the National Airways Corporation.  For more, see the book The Aircraft of Air NZ and Affiliates since 1940 by Paul Sheehan.