As 1980 passed the baton to 1981, there was reason for optimism. Details of weekday departures per Ozark Air Lines' December 15, 1980 timetable offers evidence. Baltimore /1 flight, DC-9 (continues to LGA) Cedar Rapids /2 flights, DC-9, DC-9 (2nd continued to MSP) Champaign-Urbana /2 flights, DC-9 (continues to BWI* & LGA), DC-9 Chicago-O'Hare /3 flights, DC-9, DC-9, DC-9 Denver /2 flights, DC-9, DC-9 Detroit-Metro /1 flight, DC-9 Indianapolis /2 flights, DC-9 (continues to BNA & TPA), DC-9 Minneapolis-St. Paul /1 flight, DC-9 Moline /2 flights, DC-9, DC-9 St. Louis /3 flights, DC-9 (continues to MCO), DC-9, DC-9 (3rd continues to DFW) Springfield (IL) /2 flights, DC-9 (continues to STL & COU), DC-9 (continues to STL) * Baltimore/Washington International Airport changed its three-letter code from BAL to BWI effective October 26, 1980 . Weekday departures had risen from 20 to 21 and there were now two nonstops to Denver (one return flight continued