IAF Air Funnel Zones - Darbhanga

Here is the trap specific to Darbhanga. You see a busy commercial airport, so you assume the clearance works like any other AAI airport. It does not, because the airfield itself belongs to the Air Force.

This table shows the height restrictions near military airfield surfaces and what each does to a plot around Darbhanga.

The runway here runs close to 10,000 feet, the longest in Bihar, so the approach funnel reaches far past the terminal. Any structure inside the restricted radius needs a No Objection Certificate before you build. For a defence-owned airfield like Darbhanga, defence authorities issue NOC decisions, even though AAI handles the daily flights. The surface rules follow the same NOC obstacle limitation surfaces logic used elsewhere, but the file goes through the military channel and tends to be stricter. A builder promising a tall block "next to the airport" is selling you the exact spot the funnel restricts hardest. Check the survey number against the funnel line before you sign.

The airport triggered a genuine land rush, and the marketing all points the same way: closer to the runway sounds better. For height, closer is the problem, not the pitch.

This table sorts the active corridors by their relationship to the airfield.

The corridor buyers misjudge most is the Delhi More and airport-road cluster. Projects here advertise proximity to the airport, AIIMS, and the new smart-city work as pure upside, and for a modest home it often is. The risk hides in the height plan. These plots sit within the inner horizontal surface, so a bungalow may clear while a multi-storey stalls at the defence NOC. Buy for a house and you are usually safe. Buy land banking on an apartment tower beside the runway, and the funnel, not the market, sets your ceiling.