A JETSTREAM 4100 ACFT WAS DISPATCHED IN NON COMPLIANCE WITH AN OPEN DEFERRED ITEM IN THE LOGBOOK THAT HAD BEEN REPAIRED BUT NOT CLRED FROM THE LOGBOOK. FLT RELEASE INDICATED DEFERRED ITEM WAS CLRED.

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ON JAN/XA/99 I FLEW AN ACFT WITH AN IMPROPER RELEASE FROM ZZZ (ZZZ FIELD) TO BMI (BLOOMINGTON; IL). THE RELEASE DID NOT CONTAIN A DEFERRED MAINT ITEM FROM THE ACFT'S MEL. AS I RPTED FOR DUTY; THE ACFT WAS FINISHING A MAINT INSPECTION. I PREFLTED THE ACFT AND FOUND 3 SQUAWKS AND HAD NOTICED THAT THE LOGBOOK HAD AN OUTSTANDING DEFERRED MAINT ITEM -- AN ENVIRONMENTAL CTL SYS OR PRESSURIZATION CONTROLLER. THE ACFT HAD 2; AND 1 COULD BE DEFERRED. THE DMI HAD BEEN DISCOVERED BY THE CAPT 9 DAYS EARLIER AND NEEDED TO BE FIXED BY MIDNIGHT TO BE LEGAL. MAINT PERSONNEL ATTENDED TO THE 3 SQUAWKS THAT I HAD DISCOVERED AND HAD MENTIONED THAT THE OUTSTANDING DMI HAD BEEN REPAIRED AND WE HAD BOTH PRESSURIZATION CONTROLLERS. IN BOTH THE CAPT'S AND MY PRESENCE; THIS OCCURRED AS PAX WERE BOARDING THE ACFT AND DEP TIME WAS APCHING. THE MAINT PERSONNEL SIGNED OFF THE SQUAWKS AFTER REPAIRING THEM. THE CAPT REVIEWED THE RELEASE AND LOAD MANIFEST WHILE I COMPLETED MY PREFLT CHKS. WE DEPARTED AND I FLEW THE ACFT TO BMI. AFTER THE FLT; I ENTERED THE FLT TIME INTO THE ACFT LOG. AT THIS TIME; I NOTICED THAT THE DMI HAD NOT BEEN SIGNED OFF AND WAS NOT LISTED ON THE RELEASE. I NOTIFIED THE CAPT; WHO THEN PHONED THE DISPATCHER. WE THEN HAD THE DISPATCHER LIST THE DMI ON THE RETURNING FLT'S FLT RELEASE. UPON OUR RETURN TO ZZZ; MAINT PERSONNEL SIGNED OFF THE OUTSTANDING DMI. THE FLT FROM ZZZ TO BMI WAS WITH AN IMPROPER FLT RELEASE.