Northwest Airlines announced today it's following other major U.S. carriers in adopting a so-called "Use it or Lose it" policy. Under the policy, the airline will no longer let travelers change their itineraries after their ticketed flight has departed. Northwest will allow changes before a flight departs - for a $100 fee. Northwest says the change will allow the airline to better manage its inventory and reduce its no-show rate. Neal Kraemer is co-owner of Twin Cities-based Carousel Travel. He says he's not suprised Northwest is adopting the policy but he thinks it could drive customers away.