What does PHI stand for?

MLA style: "PHI." Acronym Finder . 2012. AcronymFinder.com 1 Jun. 2012 http://www.acronymfinder.com/Petroleum-Helicopters-Inc-(PHI).html
Chicago style: Acronym Finder . S.v. "PHI." Retrieved June 1 2012 from http://www.acronymfinder.com/Petroleum-Helicopters-Inc-(PHI).html
APA style: PHI. (n.d.) Acronym Finder. (2012). Retrieved June 1 2012 from http://www.acronymfinder.com/Petroleum-Helicopters-Inc-(PHI).html

Petroleum Helicopters Inc

This definition appears very rarely and is found in the following Acronym Finder categories:

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Samples in periodicals archive:

About PHI Air Medical Group: A business unit of Petroleum Helicopters Inc.

Business Editors NEW YORK--(BUSINESS WIRE)--June 7, 2004 The ratings on Petroleum Helicopters Inc.

About Air Evac Services: A wholly owned subsidiary of Petroleum Helicopters Inc.