Forty-year-old Robert Coppack, will remain in custody until a detention hearing on Monday in federal court.
An FBI affidavit says two women seated near Coppack complained about him on Tuesday’s overnight flight, prompting the crew to steer him toward the back of the plane. The affidavit says he then groped a retired flight attendant as he walked down the aisle.
Coppack is charged with intimidating a crew member.
Neither relatives listed at his California address nor a public defender returned calls for comment on Wednesday.
US Airways spokeswoman Michelle Mohr says the flight eventually arrived at Heathrow, about four hours late.