Mark Zuckerberg’s sister Randi Zuckerberg, the former Director of Market Development of Facebook was sexually harassed on an Alaska Airlines flight. Randi Zuckerberg, took to social media Wednesday to detail her recent flight between Los Angeles and Mazatlan, Mexico.

In a letter to executives of the Seattle-based airline, she said she was extremely uncomfortable with a man sitting near her, explaining he constantly made sexually explicit and lewd comments to her and others in the first-class section while being served multiple alcoholic drinks.

Zuckerberg said the man talked about touching himself, asked if she fantasized about the colleague she was travelling with, and commented on the bodies of female passengers as they boarded the plane. He also mocked “Millennial women” when talking about recent sexual harassment news reports. Zuckerberg said she reported the man to flight attendants, who seemed to make light of the situation while replying the man was a regular flyer on the route. She said she was upset when they told her not to take it personally and offered to move her to a seat at the back of the plane. “Which I almost did until I realised … why should I have to move? I’m the one that is being harassed!” she wrote.

Randi posted on Facebook stating that “Feeling furious, disgusted and degraded after an Alaska Airlines flight during which the passenger next to me made repeated lewd, inappropriate, and offensive sexual remarks to me.”

She wrote that she was furious with the airline for “knowingly and willingly providing this man with a platform to harass women.”

Meanwhile, Alaska Airlines has launched an investigation and has temporarily suspended her co-passenger`s travel privileges.

The airline said it contacted Zuckerberg about the “disturbing” claims and revoked the man’s travel privileges pending the outcome of the investigation. The airline said in part: “We want our guests to feel safe. As a company, we have zero tolerance for any type of sexual misconduct that creates an unsafe environment for our guests and crew members.”

Zuckerberg tweeted Wednesday that “I just got off the phone with two executives from @AlaskaAir who informed me that they are conducting an investigation and have temporarily suspended this passenger’s travel privileges. Thank you for taking this seriously.”