NORTHWEST AIRLINES STRIKE STORY - COMPETITION PROSPECTS DAN OLSON/MN PUBLIC RADIO. SUGGESTED INTRO: The seven day old Northwest Airlines strike has customers wondering if other airline companies see an opportunity to grab some of Northwest's business. The answer so far is competitors are adding some service but none is making long term plans to try break Northwest's near-monopoly control of its hubs including Minneapolis St. Paul passenger business. Minnesota Public Radio's Dan Olson reports. Restive Northwest customers have watched with envy as cut-rate airlines offering rock bottom rates have gained a toe hold at other airports.