The pilots union for Northwest Airlines Corp. said the carrier has been canceling some of its domestic flights because of a pilot shortage, the Associated Press reports. The airline did not comment on the staffing issue. Neither Northwest nor the pilots union would specify the number of flights affected. The cancellations come as about 700 Northwest pilots are on furloughs. The airline flew 5.6 percent fewer seat-miles during September, compared with a year ago. Also Friday, Northwest said it would resume talks with the Association of Flight Attendants during the week of Oct. 15.