Thai Lion Mentari Co. Ltd, trading as Thai Lion Air, is a Thai low-cost airline, operating with Thai partners as an associate company of Lion Air of Indonesia. The carrier operates from Bangkok's Don Mueang International Airport, with plans to serve domestic and international scheduled flights from other cities in Thailand. Its head office is in the Don Mueang District, Bangkok.

PT Lion Mentari Airlines, operating as Lion Air, is an Indonesian low-cost airline based in Jakarta. Lion Air is the country's largest privately run airline, the second largest low-cost airline in Southeast Asia and the largest airline of Indonesia. With Wings Air and Batik Air, Lion Group is the country's largest airline's group. The airline operates domestic as well as international routes, which connects different destinations of Indonesia to Singapore, the Philippines, Malaysia, Thailand, Australia, India, Japan and Saudi Arabia, as well as charter routes to Mainland China, Hong Kong, South Korea and Macau, with more than 630 flights per day.