B190 CREW HAD TRACK DEV.

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CHAIN OF EVENTS: OUR PART 121 FLT WAS SCHEDULED TO DEPART MORGANTOWN MUNICIPAL ARPT (MGW) FOR CLARKSBURG/BENEDUM ARPT (CKB). WE WOULD THEN PICK UP PAX AT CKB; AND CONTINUE ON TO PARKERSBURG WOOD COUNTY WILSON ARPT (PKB). EARLIER THAT DAY; OUR FLT HAD BEEN DELAYED 1 HR FOR MAINT; SO WE ARRIVED AT MGW 1 HR BEHIND SCHEDULE. AFTER ARRIVING IN MGW; I CHKED THE PAX LOADS FOR THE NEXT LEGS TO CKB AND PKB; AND THE COMPUTER SHOWED ZERO PAX. I DISCUSSED WITH DISPATCH THE POSSIBILITY OF CANCELING THE STOP IN CKB AND GOING DIRECT TO PKB; SO THAT WE COULD HAND OFF THE ACFT TO THE NEXT CREW A LITTLE BIT CLOSER TO SCHEDULE. DISPATCH AGREED; AND SAID THEY WOULD SEND OVER A RELEASE DIRECT FROM MGW TO PKB. I RECEIVED THE RELEASE AND WE DEPARTED MGW FOR PKB. AFTER A QUICK CLB TO CRUISE ON A WESTERLY HDG FOR VOR AT PARKERSBURG (JPU VOR); ATC ASKED US WHAT OUR HDG WAS FOR CKB VOR. WE TOLD THE CTLR WE WERE TRACKING DIRECT TO JPU. HE THEN ASKED US IF WE WERE CLRED AS FILED; AND WE RESPONDED 'AFFIRMATIVE.' I THEN LOOKED AT THE FLT PLAN ON THE RELEASE AND REALIZED OUR COMPANY FILED OUR FLT RTE TO OVERFLY CKB VOR BEFORE PROCEEDING ON TO JPU VOR. CKB VOR WAS ABOUT 16 MI S OF OUR DEP POINT. I THEN IMMEDIATELY REQUESTED 'PRESENT POS DIRECT PARKERSBURG' AND APOLOGIZED TO THE CTLR FOR MISUNDERSTANDING THE CLRNC. ATC GRANTED US OUR REQUEST FOR DIRECT PKB. HUMAN PERFORMANCE CONSIDERATIONS: 1) FAILING TO VERIFY FLT RTE ON RELEASE DUE TO THE COMPELLING FEELING TO 'RUSH AND CATCH UP TO THE SCHEDULE.' 2) FO'S LACK OF EXPERIENCE AND ASSERTIVENESS. THE FO HAD BEEN ON LINE FOR ABOUT 1 MONTH AND WAS NEW. SHE DID NOT QUESTION OUR ROUTING WHEN I BRIEFED THE DEP RTE. 3) FATIGUE. THIS WAS OUR 38TH LEG; 30TH FLT HR; AND 63RD DUTY HR IN 5 DAYS OF FLYING; INCLUDING ONE REDUCED REST.