Polynesian Airlines (IATA code PH) came into existence in 1959 and went through a few restructurings (Polynesian Blue in 2005, Virgin Samoa in 2011) before being closed down by the Samoan government in 2017 … it was later reincarnated as Samoa Airways which now uses the IATA code OL

this article in Yesterday’s Airlines has some photos of the PH 737 delivered from Boeing in 1981 and an ex-Ansett jet that they acquired on lease a few years later; I had flights on both of them (for certification of the Performance Data Computer System installation) that year