Biman Bangladesh Airlines (), partly transcribed from English into Bengali and the other way around; commonly referred to as simply Biman (); is the national flag carrier of Bangladesh. Its main hub is at Shahjalal International Airport in Dhaka and it also operates flights from its secondary hubs at Shah Amanat International Airport in Chittagong and Osmani International Airport in Sylhet. The airline provides international passenger and cargo services to its destinations. It has air service agreements with 42 countries. The airline's headquarters, Balaka Bhaban, is located in Kurmitola, Dhaka. Annual Hajj flights; transporting tourists and non-resident Bangladeshi workers and migrants; and the activities of its subsidiaries form an integral part of the airline's business. In the decades following its founding, the airline expanded its fleet and destinations but it was adversely affected by corruption and mismanagement.