Malaysia's road network covers 98,721 kilometres (61,342 mi) and includes 1,821 kilometres (1,132 mi) of expressways. The longest highway of the country, the North-South Expressway, extends over 800 kilometres (497 mi) between the Thai border and Singapore. The road systems in Sabah and Sarawak are less developed and of lower quality in comparison to that of Peninsular Malaysia. Malaysia has 118 airports, of which 38 are paved. The official airline of Malaysia is Malaysia Airlines, providing international and domestic air service alongside two other carriers. The railway system is state-run, and covers a total of 1,849 kilometres (1,149 mi). There are also Light Rail Transit in Kuala Lumpur.