2 CANADAIR CL65 ACFT WERE DISPATCHED IN NON COMPLIANCE WITH THE WRONG LOGBOOKS BOARDED.

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ON AUG/XA/01; ACFT X AND ACFT Y DEPARTED ZZZ. DURING THE NIGHT; A LCL MECH HAD PERFORMED ROUTINE MAINT ON EACH ACFT AND HAD TAKEN BOTH MAINT LOG CANS INSIDE THE OPS AREA TO FILL OUT THE PAPERWORK. UPON RETURNING; THE MECH MISTAKENLY PUT THE WRONG LOG CAN INTO THE WRONG ACFT. THE MISTAKE WASN'T NOTICED FOR HOURS. BY THE TIME IT WAS DISCOVERED SEVERAL FLT HOURS HAD BEEN FLOWN; AND 7 CREW MEMBERS BTWN THE 2 ACFT HAD NOT NOTICED THE MIX-UP. ALTHOUGH NO INCIDENT OCCURRED; IT LEFT THE AIRLINE; THE CREW MEMBERS; AND THE PAX IN POTENTIAL DANGER DUE TO UNKNOWN OPEN WRITE-UPS (THERE WERE NONE); UNKNOWN DEFERRALS (THERE WERE NONE); AND A POTENTIALLY OVERWT TKOF (THE AIRLINE OPERATES BOTH 51000 LBS AND 53000 LB ACFT; ALTHOUGH NO TKOFS OVER 51000 LBS WERE MADE BY EITHER ACFT). CONTRIBUTING FACTORS INCLUDED THE INCORRECT DISPOSITION OF DOCUMENTS BY THE MECH; LACK OF A PROC TO ENCOURAGE PLTS TO CHK THEIR ACFT NUMBER AGAINST THE LOG CAN; AND LACK OF KNOWLEDGE BY THE PLTS THAT SUCH AN EVENT COULD OCCUR; LEAVING NO REALISTIC REASON TO TAKE THE TIME TO CHK FOR IT. ALL PLTS INVOLVED IN THE INCIDENT HAVE CONFERRED WITH AND ENCOURAGED THE COMPANY TO PUBLISH A REQUIREMENT FOR FLCS TO XCHK ACFT NUMBERS; AS WELL AS TO PUBLICIZE THE INCIDENT IN INTERNAL COMPANY DOCUMENTS TO RAISE AWARENESS.