India, May 4 -- 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.

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.

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 t...