In the Philippines, various airlines provide discounts for senior citizens as part of the provisions under RA 9994. Common carriers like Philippine Airlines, Cebu Pacific, and AirAsia typically offer these discounts. To find a comprehensive list of participating establishments, it's best to check the official websites of these airlines or contact their customer service. Additionally, local travel agencies may have updated information on available promotions for seniors. Always ensure to inquire about specific eligibility requirements and documentation needed to access these discounts.