Eva Air also known as Evergreen Airways is a Taiwanese international airline that has been lauded for its service quality and customer satisfaction. The airline has Gradually built a reputation for offering a premium flying experience making it a preferred choice for travelers across Asia and beyond. One of the standout features of Eva Air is its comprehensive upgrade program which allows passengers to enhance their travel experience by moving to a higher class of service. This essay explores the various aspects of Eva air upgrade program, including eligibility, process, benefits and customer feedback.