Air India sabata yatha idalowa nawo Star Alliance ngati membala wathunthu. Ndegeyo tsopano yajambula kugunda kwapafupi ndi mlengalenga kudziko lakwawo India. Ndege ya Indigo yochokera ku Bagdogra idafika pafupi ndi ndege yotsika ya Air India pamwamba pa Bagdogra ku West Bengal Lachisanu masana ndikuyika okwera 250 m'ndege zonse ziwiri pachiwopsezo chachikulu.
Air Traffic Control (ATC) idapereka chilolezo kwa ndege zonse ziwiri, malinga ndi mneneri wa ndege ya Indigo.
Ndege ya Air India 879, yonyamula anthu 120, inali kutsika ndipo ndege ya Indigo Bagdogra-Delhi 6E472 yokhala ndi anthu 130 omwe adakwera idapatsidwa chilolezo chokwera mtunda wa 30,000, atero mneneri wa Indigo.
Ndege ya Indigo inanyamuka nthawi ya 1222 hrs. Pomwe adayandikirana wina ndi mnzake ndikuphwanya kulekana kwa 1000m, oyendetsa ndege ya Indigo ndi ndege ya Air India adadziyendetsa kuti apewe kuphonya, adatero.
Woyendetsa ndege wa Indigo adapeza upangiri wothana ndi kugunda kwa magalimoto (TCAS) (RA). Malinga ndi Standard Operation Procedure (SOP), Capt adatsata RA ndi kutsika ndipo ndege ya AI idatsatiranso RA ndikutembenukira kumanja, wolankhulirayo adatero.
Akaputeni atalandira uthenga "womveka bwino wa mkangano", adabwerera kunthawi yake, anawonjezera.
Ndege ya Indigo idatera ku Delhi nthawi ya 1415hrs. A DCGA akufufuza za nkhaniyi.
