Mid air collision averted last even in Bangladesh air space by 47 seconds. One Indigo flight was enroute to Kolkata from Guwahati and another Indigo flight was enroute to Guwahati from Chennai. Both the aircrafts was flying in the same height. But Dhaka atc responsible for manoeuvring the flight from their respective paths, did not alert either of the flight. Kolkata atc proactively took charge and alerted the Chennai flight to divert in the right direction.