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Flyer accused of groping woman in first class says he ‘touched whatever he could reach’

A French national has been accused of sexually assaulting a co-passenger on a flight from Switzerland to the United States.

Updated on: May 4, 2026, 13:27:52 IST
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A French national has been accused of sexually assaulting a co-passenger on a flight from Switzerland to the United States. Guillaume Sebastien Roger Mattler, 48, faces a federal charge of abusive sexual contact over an incident that unfolded on Tuesday.

The incident took place onboard a Swiss Air flight
The incident took place onboard a Swiss Air flight

Mattler has been accused of sexually assaulting a 29-year-old woman who was seated next to him in the first-class section of a Swiss International Air Lines flight. After the incident, he tried to hand her a creepy note as well.

What happened on the flight?

According to a Local10 report, Mattler and the 29-year-old woman, whom he did not know, were “seated next to each other in the first-class cabin” during the flight from Zurich to Miami on Tuesday.

Two other passengers on the flight saw Mattler touching the woman as she slept, according to a federal criminal complaint. One “took several videos on his cell phone” while the other became “very concerned and went to find a flight attendant.”

“Witness 2 observed Mattler moving his hand in a ‘submarine’ motion, as if trying to get his hand under the Victim’s clothing and/or between her legs,“ FBI Special Agent Peter Ganzert wrote in the complaint.

When a flight attendant walked up to Mattler and the woman, he had “his hand on (her) crotch, over her jeans, making a scooping or rubbing motion on her vagina.”

What did the cabin crew do?

Mattler was unable to tell the flight attendant whether he knew the woman. He was moved to the economy class section of the plane.

Court documents say that the flight attendant then woke up the woman to explain what had happened. The woman was “shocked” and “began shaking and crying”.

The creepy note

Later, the cabin crew brought Mattler back to his seat in first class so he could collect his belongings. At this point, the French man tried to hand the woman a note saying, “You look beautiful when you are sleeping.”

Mattler told investigators that “nothing happened on the flight.” When confronted with video evidence, however, he “admitted that he touched the woman sitting next to him and that he did not think it was such a big deal.”

He claimed initially that he had touched the woman’s “lower back and upper buttocks”. Once informed that witnesses saw him touching her genital area, he said “he touched whatever he could reach from across the arm-rest.”

The French national was produced before a Miami federal court on Wednesday. His pre-trial detention hearing is slated for Monday.

  • Sanya Jain
    ABOUT THE AUTHOR
    Sanya Jain

    Sanya Jain is an Assistant Editor with Hindustan Times Digital. She has nearly a decade of experience in covering offbeat stories that speak to the everyday experience - from viral videos to human interest copies that spark conversation. Her interests stretch across business, pop culture, social media trends, entertainment and global affairs. Before joining Hindustan Times, Sanya spent two years with Moneycontrol and five years with NDTV. She holds an undergraduate degree in English literature from St Stephen’s College, Delhi, and a master’s in journalism from the Xavier Institute of Communications, Mumbai. Sanya has a sharp eye for spotting emerging trends and looking for newsworthy angles to elevate viral posts into meaningful narratives. She was the first one, for example, to cover Narayana Murthy’s remark on 70-hour work weeks that sparked a national conversation. She is equally at ease writing about business leaders as about the common man, about issues of national importance and memes that amuse social media. Sanya enjoys speaking with content creators, newsmakers and entrepreneurs to transform everyday moments into engaging, slice-of-life stories that resonate with readers. When she is not working, Sanya can be found curled up with a good book. Born and raised in Lucknow, she has spent the last several years in Delhi. She is deeply interested in animal welfare and now spends a lot of her time running after her destructive orange cat.Read More

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