TRANSPORTATION

Northwest Cuts Fares: Northwest Airlines is cutting fares again, by $35 to $50 on domestic travel. The airline placed coupons in Sunday newspapers for use on flights between Sept. 6 and Dec. 14 that are booked by Aug. 31. Northwest is offering $35 coupons to reduce promotional fares already listed at between $150 and $249 and $50 coupons good on fares posted at $250 or more. The tickets are non-refundable, must be purchased at least 14 days before travel and require a Saturday night stay. Representatives for three other major airlines, American, Continental and Delta, said they were studying Northwest’s move. Each said their airline would review it before deciding what to do.