The first Pan American Clipper arrived here in 1938. I guess that has to be the first crossing of the Pacific to and from NZ.
The first to arrive from the USA was one of Pan American's Sikorsky S.42, which alighted at Auckland on 30 March 1937.
Author: Swift to the Sky – New Zealand’s Military Aviation History Author/publisher: For Your Tomorrow - A record of New Zealanders who have died while serving with the RNZAF and Allied Air Services since 1915 & A Passion For Flight - New Zealand aviation before the Great War. Publisher of Gp Capt C M Hanson’s By Such Deeds - Honours and Awards in the Royal New Zealand Air Force, 1923-1999