Northwest Airlines Cargo Boeing 747-251(SF) (N631NW) (Michael Davis Photography) Tags: nashville kbna bna northwestairlines northwestairlinescargo northwestcargo nw nwa boeing747 b747 boeing 747251 747251sf n631nw aviation photography flight jet airplane airliner jetliner cargo cargoplane cargojet cargoramp ramp arrival jumbojet nightaviation cockpit 747cockpit 747classic aerotagged northwest airlines 747 747200 747200b 747251b 747200bsf 747251bsf boeing747200 boeing747251 boeing747200b boeing747251b boeing747200bsf boeing747251bsf aero:man=boeing aero:model=747 aero:series=200b aero:series=251b aero:special=sf aero:msn=23111 aero:ln=594 aero:tail=n631nw aero:airline=nwa aero:airport=kbna international airport nashvilleinternationalairport