BILLINGS, Mont. - A Northwest Airlines flight from Minneapolis to Boise, Idaho, made an unscheduled landing in Billings on Tuesday after a Bergenfield, N.J., woman became unruly and assaulted others on board, a federal aviation official said.

Yellowstone County authorities identified the woman as Judith McKenith, 55. She was being held in the county detention facility on a federal charge of interference with airline personnel, officials said.