Sgt. Michael Rodriguez says 20-year-old Deshon Marman was boarding a flight Wednesday to Albuquerque, N.M., when a U.S. Airways employee noticed his pants were "below his buttocks, but above the knees, and his boxer shorts were showing."
Rodriguez tells the San Francisco Chronicle that the employee asked Marman to pull up his pants, but he refused. She then asked him to leave the plane.
The officer says that after 15 minutes, Marman got off the plane and was cited for trespassing.
Marman's mother, Donna Doyle, tells the paper that her son had attended a friend's funeral and he was still in an emotionally raw state.
US Airways spokeswoman Valerie Wunder says the airline's dress code forbids "indecent exposure or inappropriate" attire.