Infrastructure
The Airports Authority of India granted technical clearance and ₹28.42 crore for Birpur airport in Supaul, covering a reinforced bitumen runway, an integrated passenger terminal and air traffic control systems.
The airstrip, built in the 1950s–60s during construction of the Kosi Barrage, has been largely unused for decades. Revived under UDAN, it is expected to support trade with Nepal, tourism and flood-relief logistics in the Kosi basin.