A 63-percent affirmative vote last month by the pilots of Northwest Airlines for a new labor deal officially frees Northwest (operating as Compass Airlines) to fly regional jets certified to hold up to 76 seats. Northwest plans to launch the operation next month with a single 50-seat CRJ200 flying twice daily between Minneapolis and Washington Dulles International Airport. Within five years it expects to field at least 36 Bombardier CRJ900s or Embraer 175s.