Unless the context indicates otherwise, the terms "we," "our," "ours," "us" and the "Company" refer to Era Group Inc. and its consolidated subsidiaries. "Era Group" refers to Era Group Inc., incorporated in 1999 in Delaware. "Common Stock" refers to the common stock, par value $0.01 per share, of Era Group. The Company's fiscal year ended on December 31, 2018.
We are one of the largest helicopter operators in the world and the longest serving helicopter transport operator in the United States ("U.S."), which is our primary area of operations. Our helicopters are primarily used to transport personnel to, from and between offshore oil and gas production platforms, drilling rigs and other installations. In the years ended December 31, 2018, 2017 and 2016, approximately 71%, 66% and 69%, respectively, of our total operating revenues were earned in the U.S. In the same periods, approximately 29%, 34% and 31%, respectively, of total operating revenues were earned in international locations. In addition to the U.S., we currently have customers in Brazil, Colombia, India, Mexico, Spain and Suriname.
The primary users of our helicopter services are international, independent and major integrated oil and gas exploration, development and production companies. Our customers include Anadarko Petroleum Corporation ("Anadarko"), Petroleo Brasileiro S.A. ("Petrobras") and the Bureau of Safety and Environmental Enforcement ("BSEE"), a U.S. government agency. In the years ended December 31, 2018, 2017 and 2016, approximately 95%, 91% and 88%, respectively, of our operating revenues were derived from helicopter services, including emergency response services, provided to customers primarily engaged in offshore oil and gas exploration, development and production activities and U.S. government agencies that oversee these activities. Accordingly, our results of operations are, to a large extent, tied to the level of offshore exploration, development and production activity by oil and gas companies in the Americas, including the U.S. Gulf of Mexico and Brazil. In addition to serving the oil and gas industry, we provide utility services to support firefighting and pipeline survey activities, among other activities.