The airline that now operates to Wanganui airport with a Saab 340A and a Metroliner III was established in which year ?
1984
Title: Whanganui Airport
Passage: Whanganui Airport (named Wanganui Airport until 2016) is the airport that serves Whanganui, New Zealand (IATA: WAG, ICAO: NZWU) .  It is located to the south of Whanganui River, approximately 4km from the centre of Whanganui.  The airport was opened in 1954, and services to the airport began in November that year.  In September 2013, Air New Zealand announced that it would withdraw services from Whanganui to Wellington and Taupo in December 2013.  Sounds Air briefly took over the Wellington route, however this was later terminated on 15 May 2015.  The airport has a single terminal with just two gates.  Air Chathams now operates to Wanganui with a Saab 340A and a Metroliner III.
Title: Saab 340 AEW&amp;C
Passage: The Saab 340 AEW&C is a Swedish airborne early warning and control (AEW&C) aircraft; a variant of the Saab 340 aircraft is designated S 100B Argus by the Swedish Air Force.
Title: Air Chathams
Passage: Air Chathams Limited is an airline based in Te One, the Chatham Islands, New Zealand.  It was established in 1984 and operates scheduled passenger services between the Chatham Islands and mainland New Zealand along with routes between Auckland and Whakatane, and Auckland and Whanganui.  Its main base is Chatham Islands / Tuuta Airport.
Whanganui Airport Air Chathams