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Premium economy class, also known as elite economy class or economy plus class, is a travel class offered on some airlines. This travel class is positioned as a middleground between standard economy class and business class in terms of price, comfort, and amenities. In 1991, EVA Air was the first to introduce "Evergreen Class" (later renamed to Elite Class, and later renamed to Premium Economy Class) and had since become the first airline to offer this class of service in the world. In some ways, Premium Economy class has become a standard reflecting what Economy class was like 40 years ago (or more); as an example the seat pitch of United Airlines' Economy Class was back in the 1970s, the same seat pitch as most airlines' Premium Economy these days.