ADVANCED COCKPIT MLG FLC ENTERS WRONG ARR ARPT INTO ACARS AND GETS YESTERDAY'S FLT PLAN AND FOLLOWS IT.

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THE DEP STATION (BWI) WAS INADVERTENTLY ENTERED AS THE DEP AND ARR STATIONS IN ACARS (E.G.; BWI/BWI). CLRNC FOR THE TRIP WAS RECEIVED THROUGH ACARS. SINCE I HAD FLOWN THIS TRIP SEQUENCE SEVERAL TIMES WITH THE SAME FO AND THE ROUTING WAS ALWAYS THE SAME I ONLY CHKED THE TRANSPONDER CODE AND ALT. I DID NOT QUESTION WHY WE WERE CLRED TO 10000 FT INSTEAD OF THE USUAL 4000 FT. NO CHK OF OUR CLRNC WAS MADE WITH BWI SINCE NONE IS REQUIRED (USUALLY AT LEAST THE READING BACK OF THE TRANSPONDER CODE IS REQUIRED AT SOME ARPTS). WE RECEIVED THE CORRECT LOAD CLOSEOUT DURING TAXI AND THEN TOOK OFF. THE FIRST CLUE THAT SOMETHING WAS AMISS WAS WHEN DEP CTL WOULDN'T ANSWER US. A QUICK RETURN TO TWR GOT US ON THE RIGHT FREQ. I CALLED DEP CTL AND SAID THAT WE WERE CLBING TO 10000 FT. HE DIDN'T QUESTION WHY WE WERE CLBING TO 10000 FT INSTEAD OF 4000 FT (THE REAL CLRNC ALT); BUT INSTEAD CLRED US TO 17000 FT AND TOLD US TO CHANGE OUR SQUAWK (CLUE #2). CLUE #3 CAME WHEN WE REQUESTED OUR FLT PLAN FROM ACARS AND IT GAVE US A FLT PLAN FOR A DFW DIRECT BWI TRIP THAT WAS FLOWN THE DAY BEFORE. NOW IT ALL CAME INTO FOCUS. I CHKED OUR ACARS CLRNC AND IT WAS INDEED FOR FLT #1 DFW TO BWI FLOWN THE DAY BEFORE INSTEAD OF FLT #2 BWI TO ORD! FACTORS THAT I FEEL CONTRIBUTED TO THIS INCLUDE: 1) FATIGUE -- IT WAS AN EARLY MORNING GO PLUS I HAD FLOWN 7 OUT OF THE PREVIOUS 9 DAYS. 2) COMPLACENCY -- I HAD FLOWN THE SAME TRIP WITH THE SAME FO SEVERAL TIMES BEFORE. 3) PROCS -- IF WE WERE REQUIRED TO AT LEAST READ BACK THE TRANSPONDER CODE TO CLRNC DELIVERY WE WOULD HAVE FOUND OUT SOMETHING WAS WRONG. 4) COMPUTER PROGRAMMING -- BIAS THE COMPUTER TO PREVENT IT FROM GIVING OUT CLRNCS THAT ARE 12 HRS OLD. WE DID GET THE CORRECT LOAD CLOSEOUT SO WHY NOT THE CORRECT CLRNC?