Originally developed to handle diversions of aircraft from Singapore Changi Airport at Singapore in case of an emergency, it has sufficient facilities for wide-body aircraft such as Boeing 747s. The airport has the longest runway in Indonesia and the second-longest runway in Southeast Asia, after Kuala Lumpur International Airport, at 4,214 metres (13,825 ft) long. The airport stretches over a land area of about 1,800 hectares, of which only 40% is currently used.