Biman Bangladesh Airlines is the National Flag Carrier of Bangladesh, with its main hub at Zia International Airport in Dhaka. It also operates flights from Shah Amanat International Airport in Chittagong and earns significant revenue from the connecting service to Osmani International Airport in Sylhet. Currently it provides passenger and cargo service in different international routes in Asia and Europe along with major domestic routes. It has Air Service Agreements with 42 countries; but maintains flights to only 18 at present. Until July 2007 the airline was wholly owned and managed by the Government of Bangladesh; on 23 July 2007, it was transformed into Bangladesh's largest Public Limited Company by the then Caretaker government of Bangladesh.