UNAUTH LNDG -- ACR FLC ON A SHORT BUSY FLT FORGET TO CHANGE TO TWR FREQ AND LAND WITHOUT CLRNC.

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IT'S A VERY SHORT (14 MIN) FLT FROM SDF TO LEX. THEREFORE; BY THE TIME YOU DO THE TKOF; DEP; LEVELOFF; TURN TOWARDS THE ARPT; DO ALL APPROPRIATE CHKLISTS AND COPY ATIS; YOU BECOME VERY RUSHED DURING THE ARR. EVEN WHEN YOU ARE THINKING AHEAD AND START THE DSCNT AND APCH EARLY; IT IS STILL EASY TO GET BEHIND AND GET HIGH ON THE GLIDE PATH. THIS IS WHAT HAPPENED TO US THIS PARTICULAR NIGHT. I WAS FLYING THE ACFT AND THE CAPT WAS DOING THE PNF DUTIES AND TALKING ON THE RADIOS. THE WX WAS VERY CLR AND WE COULD SEE THE ARPT WELL. I WAS HIGH AND FAST AND DSNDING WITH ALL THE DRAG OUT AT A HIGH DSCNT RATE AND MANEUVERING TO LINE UP ON FINAL. THE CAPT ASKED APCH IF WE COULD MANEUVER ON FINAL TO HELP LOSE ALT AND THE APCH CTLR TOLD US; 'CLRED TO DO WHATEVER YOU WANT.' I MANAGED TO LINE UP WITH THE RWY ON SPD; ON GLIDE PATH; AND IN THE LNDG CONFIGN BY 1000 FT ABOVE THE ARPT. THE CAPT CALLED '1000 FT ABOVE.' I BELIEVE WE BECAME SO FIXATED ON THE APCH THAT WE FORGOT TO CALL TWR. THE APCH CTLR DID NOT SWITCH US OVER TO TWR AND WE REALIZED IT ONCE WE TOUCHED DOWN. WE MISSED THE NORMAL CUES WHICH WOULD HAVE ALERTED US TO OUR LACK OF LNDG CLRNC; SUCH AS: CALLING TO OURSELVES; 'CLRED TO LAND' OR TURNING ON THE LIGHTS. BY THE TIME WE PULLED OFF THE RWY; WE FELT PRETTY SICK AT KNOWING WHAT JUST HAPPENED.