COMPANY PROVIDED PREDEP CLRNCS FOR RPTR'S FLT SWITCHED FROM ANOTHER FLT INADVERTENTLY. FLC DISCOVERED THE SWITCHED PDC WHEN ADVISED BY CTLR THAT THEIR SQUAWK WAS IN ERROR.

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WE USE PDC'S AT DENVER (PRE DEP CLRNCS). PRINTED PDC'S ARE IN OUR FLT PACKETS ALONG WITH WX; FLT RELEASE; FLT PLAN; ETC. I TOOK THE DEP CTL FREQ AND TRANSPONDER SQUAWK FROM THE PDC AND PROGRAMMED THEM INTO THE EQUIP. I DIDN'T NOTICE THE PDC I HAD WAS NOT THE PROPER ONE FOR OUR FLT. ANOTHER OF OUR COMPANY'S FLTS HAD OURS; WE HAD THEIRS. THE PAPERS HAD BEEN PUT IN THE WRONG FLT PACKETS. I DIDN'T NOTICE ALL THAT -- I ONLY SAW THE DEP FREQ AND TRANSPONDER SQUAWK -- THE ONLY VARIABLES I DIDN'T HAVE MEMORIZED. AFTER TKOF; DEP CTL QUESTIONED OUR SQUAWK AND HAD US CHANGE TO ANOTHER. WE DID; AND RPTED THE SQUAWK GIVEN IN OUR PDC. ABOUT THAT TIME; OUR OTHER COMPANY FLT LIFTED OFF; AND CAME UP AGAINST THE SAME PROBLEM. BY THEN; I REALLY LOOKED AT OUR PDC AND REALIZED THE MIXUP. WE SORTED IT OUT WITH ATC AND BOTH FLTS CONTINUED ON. HUMAN PERFORMANCE: PDC'S SAVE TIME AND RADIO TRANSMISSIONS AND ERRORS. IF THEY ARE USED CORRECTLY. WE HAD LATE PAX AND BAGGAGE AND A DELAY WHICH DIVERTED OUR ATTN. NO EXCUSE; JUST ANOTHER FACTOR. WE ARE ACCUSTOMED TO 'CLRED AS FILED' -- SAME RTE; DEP PROCESS; ETC. I LOOKED ONLY FOR THE THINGS I NEEDED TO FILL IN THE BLANKS AND NOT FOR THE OBVIOUS -- WAS THIS PDC FOR OUR FLT? THE FOLKS PREPARING OUR FLT PACKETS HAD NEVER MIXED UP THE INFO BEFORE; AND I DIDN'T THINK TO CHK OUR PREVIOUSLY FLAWLESS SOURCE. INTERESTING THAT AT LEAST 5 PEOPLE (PREPARER; ME; MY CAPT; OTHER FO AND CAPT) MISSED THE MIXUP.