Capital A Berhad, operating as AirAsia, is a Malaysian multinational low-cost airline headquartered near Kuala Lumpur, Malaysia. It is the largest airline in Malaysia by fleet size and destinations. AirAsia operates scheduled domestic and international flights to more than 166 destinations spanning 25 countries. Its main base is KLIA Terminal 2, the low-cost carrier terminal at Kuala Lumpur International Airport (KLIA) in Sepang, Selangor, Malaysia. Its affiliate airlines AirAsia Cambodia, Thai AirAsia, Indonesia AirAsia, and Philippines AirAsia have bases in Phnom Penh, Bangkok–Don Mueang, Jakarta–Soekarno-Hatta, and Manila–Ninoy Aquino airports respectively, while its sister airline, AirAsia X, focuses on long-haul routes. AirAsia's registered office and head office is at Kuala Lumpur International Airport.

A low-cost carrier (LCC) or low-cost airline, also called no-frills, budget or discount carrier or airline, is an airline that is operated with an emphasis on minimizing operating costs. It sacrifices certain traditional airline luxuries, for cheaper fares. To make up for revenue lost in decreased ticket prices, the airline may charge extra fees such as for carry-on baggage. As of April 2020, the world's largest low-cost carrier is Southwest Airlines, which operates primarily in the United States, as well as in some surrounding areas.