Malaysian Airline System Berhad, doing business as Malaysia Airlines (abbreviated MAS), is the flag carrier of Malaysia. Malaysia Airlines operates flights from its home base, Kuala Lumpur International Airport and with a secondary hub at Kota Kinabalu and Kuching. The airline has its headquarters on the grounds of Sultan Abdul Aziz Shah Airport in Subang, Selangor, in Greater Kuala Lumpur. Malaysia Airlines operates flights in Southeast Asia, East Asia, South Asia, Middle East and on the Kangaroo Route between Europe and Australasia. It operates transpacific flights from Kuala Lumpur to Los Angeles, via Tokyo. Apart from the airline the group also includes aircraft maintenance, repair and overhaul (MRO), and aircraft handling. Malaysia Airlines has two airline subsidiaries: Firefly and MASwings. Firefly operates scheduled flights from its two home bases Penang International Airport and Subang International Airport. The airline focuses on tertiary cities. MASwings focuses on inter-Borneo flights. Malaysia Airlines has a freighter fleet operated by MASKargo, which manages freighter flights and aircraft cargo-hold capacity for all Malaysia Airlines' passenger flights. MASCharter is another subsidiary of Malaysia Airlines, operating charter flights using Malaysia Airlines' aircraft. After recovering from past losses, Malaysia Airlines is keen on merger and acquisition (M&A) activities: particularly airlines in the Asia Pacific region. Malaysia Airlines was ranked second with score 88 in Aviation Week's Top Performing Companies which measures financial viability of an airline.