A California man accused of groping and sexually propositioning a teenage girl on a flight from Los Angeles to Salt Lake City has been sentenced to probation.

Federal Judge Tena Campbell ordered the Oceanside, California, man to serve three years of probation and 100 hours of community service at a hearing in Salt Lake City Friday.

Hans Loudermilk apologized, saying he was in the beginning stages of bipolar disorder at the time and has since been treated. He pleaded guilty in December to a misdemeanor offensive touching charge, acknowledging touching the 15-year-old's chin and rubbing her leg.

Prosecutors said the 66-year-old was sitting next the girl when he told her he could teach her things sexually that boys her age could not and said she was old enough to marry him in Utah.