AIRLINES

Northwest Revamps Fare Structure: The chaos in airline fare pricing took a new turn when Northwest Airlines said it was going to revive cheaper 30-day advance purchases that the industry abandoned some time ago. Northwest said that beginning today, it will offer the new non-refundable domestic fares, which will provide savings of up to 10% for travelers who can plan their trips that far in advance. Rivals were caught off guard by Northwest’s announcement and had no immediate response.