The Centre today assured the Odisha government of all support to upgrade Biju Patnaik Domestic Airport in Bhubaneswar into an international airport at the earliest.Civil Aviation Minister Ajit Singh also assured ChiefMinister Naveen Patnaik, who called on him in New Delhi, that his ministry will advise Airports Authority of India (AAI) to take up the work relating to expansion of airstrip at Jharsuguda. Mr Singh said his ministry will also advise Air India and other domestic airlines to start international operations from Bhubaneswar.