Genevieve Pascolla did not bargain for the disturbing sight her eyes beheld while travelling from London’s Heathrow to Chicago.

She saw a man masturbating beside her on the plane and when she complained to flight attendants, they laughed and made jokes at her, so she filmed the man in the act and shared it online.

Pascolla, 26 took to Instagram to share a video of the incident and the response she got from United Airlines after sending them a formal complaint.

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She wrote: "On this flight the man next to me started masturbating. I woke up and saw him touching himself under a blanket. I woke the woman next to me and got out of there to tell a flight attendant, the attendants checked and confirmed that he was masturbating in public.

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"They then started making jokes about the situation asking 'what perfume are you wearing' and excusing him saying 'he’s had a bit of wine' no one stopped him."

She continued: "He was allowed to finish, with a child sitting closely by. After exiting the plane first to talk to security, the security guard asked me if I’d like an apology from the offender I immediately rejected the request."

Genevieve, who works as a photographer, said the incident happened when she was travelling home to Chicago on 4 June.

Watch the offensive video below (Viewer's Discretion)