Malaysia Airlines owns two subsidiary airlines: 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. Malaysia Airlines also provides aircraft maintenance, repair and overhaul (MRO),[5] and aircraft handling services to other companies.