[2][3] This is the second time Kamaleshwar Mukherjee and Dev are working as a director-actor duo, after the 2013 film Chander Pahar.

He says that he will then fly back to Kolkata to celebrate his son's birthday, after much conversation the crew finally starts it descend to Delhi.

Meanwhile Another aircraft has taken off from Delhi, the ATC orders the flight to ascend but the captain didn't hear it properly.

Both the pilots try their best to evade but it's too late resulting in a deadly crash, killing passengers and crew of both the aircraft.

Justin reveals that Kirti has become extremely, because of constant breakups and she is unable to find her true love.

Much to her shock, she sees Dibyendu with a girl named Riya, heartbroken and frustrated, Kirti completely broke down in tears.

As the flight is approaching Kolkata, the aircraft suddenly faces hydraulic failure, damaging both the engines and resulting in crash, killing everyone.

Film then shifts to another flashback, where it shows Dibyendu meeting Riya in a dance school, and after that their friendship turned into relationship, they get married.

Much to her disappointment, her friend Justin makes her understand it was another crush, but Kirti rebukes, claiming she was in love with Dib.

At the present, OA511 is on its approach to Kolkata, suddenly faces slow compression failure, i.e., leakage in the fuselage, forcing the aircraft to fly from 36,000 feet to 9,000, the area where the weather condition is bad.

While the performances of the main cast was praised, the review criticized Dev's delivery of his English dialogue, describing it as sometimes "barely understood".

The heavy use of visual effects was also criticized for being unrealistic, but overall the film was praised in all other aspects from the acting to the music.

The soundtrack contains four songs, including some sung by popular singers Atif Aslam and Arijit Singh.

The first single, titled "Mithe Alo", was originally sung by Atif Aslam (in his bengali debut) and Nikhita Gandhi and released on 23 August 2017.

by Mexican duo Jesse & Joy, which featured in their 2011 album ¿Con Quién Se Queda El Perro?.

Following a copyright infringement lawsuit, the song was recomposed by Amjad Nadeem Aamir and replaced by a new version sung by Arnab Dutta and Paroma Dasgupta.

Atif Aslam's version was removed from all platforms, though some users who had downloaded the original track uploaded it to YouTube unofficially.

The second single from the album, "Bhalobasa Jaak", is sung by Arijit Singh and Somlata Acharyya Chowdhury and was released on 5 September.