Nagpur-Kolkata IndiGo Flight: An IndiGo flight from Nagpur to Kolkata on Thursday made an emergency landing at Raipur Airport after receiving a bomb threat which turned out to be a hoax. Nagpur-Kolkata IndiGo Flight: An IndiGo flight from Nagpur to Kolkata on Thursday made an emergency landing at Raipur Airport after receiving a bomb threat which turned out to be a hoax. Zee News :Business