Alaska Airlines says it’s investigating a claim that flight attendants allowed a passenger to sexually harass a former Facebook executive on a flight.

Randi Zuckerberg, who is also Facebook founder Mark Zuckerberg’s sister, took to social media to detail her recent flight between Los Angeles and Mazatlan, Mexico.

She said she was extremely uncomfortable with the man sitting near her who constantly made sexually explicit and lewd comments to her and others in the First Class passenger area, all while being served several alcoholic drinks.

Zuckerberg said she reported it to flight attendants, who replied that the man was a regular flyer on the route and seemed to make light of the situation.

The airline said they’re revoking the man’s travel privileges while conducting a full investigation.

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Photo Credit: In this Oct. 17, 2017 file photo, Randi Zuckerberg, sister of Facebook founder Mark Zuckerberg, participates in the BUILD Speaker Series Be Fierce tech panel in New York. Alaska Airlines says it's investigating a claim that flight attendants allowed a passenger to sexually harass Zuckerberg on a flight. Andy Kropa / Invision via Associated Press