Thank you, Hamil. I will excpect this mode of opreation as normal for Kolkata and take action on IFBP or 121.5 to broadcast intentions if necessary. Our present flight routings do not routinely transit Dhaka's airspace, but instead pass further south over the Bay. In the past such flight were typically routed further north along A599, but this is no longer the case for reasons unbeknownst to me (perhaps dhaka has increased their overflight fees? More likely China has restricted the route.).