GLF3 FO TOLD CLRNC DELIVERY THEY WERE GOING TO ONE ARPT; WHEN IN FACT THEY WERE GOING TO ANOTHER ARPT.

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WE HAD COMPLETED A FLT FROM SEATTLE TO SANTA ANA AND DROPPED OUR PAX. THE PIC AS OFF-LOADING BAGGAGE WHILE I PREPARED THE COCKPIT FOR OUR RETURN TO HOME BASE AT VAN NUYS. I CALLED FOR A TWR ENRTE TO VAN NUYS (I THOUGHT) AND WAS PROGRAMMING THE FMS WITH THE TWR ENRTE CLRNC I HAD RECEIVED NUMEROUS TIMES BEFORE. IN THE MIDST OF MY PROGRAMMING; CLRNC CALLED AND READ MY CLRNC WITH ALT; DEP AND SQUAWK CODE. I HAD ALREADY WRITTEN THE CLRNC PRIOR TO HEARING FROM CLRNC DELIVERY; SO REALLY FOCUSED ON ALT RESTR; DEP AND SQUAWK INFO. I REPEATED IT BACK; AND CLRNC CONFIRMED MY READBACK. WE DEPARTED SNA ON THE MUSEL6 DEP SEAL BEACH (SLI) TRANSITION. WHILE ON A 175 DEG HDG SHORTLY AFTER DEP; ATC ADVISED 'TURN TO 190 DEG HDG RADAR VECTORS JOHN WAYNE.' THE CAPT ADVISED ATC WE WERE ENRTE TO VAN NUYS. ATC CONFIRMED VAN NUYS; AND THEN ISSUED A NEW RADAR VECTOR. THE REST OF THE FLT WAS UNEVENTFUL UNTIL WE LANDED AT VAN NUYS; THE TWR ADVISED US AFTER CLRING THE RWY TO CONTACT GND FOR A PHONE NUMBER. WE CALLED GND AND THEY GAVE A NUMBER TO CALL AND TO ASK FOR THE AREA SUPVR. I CALLED AND WAS TOLD THAT I HAD ASKED FOR A TWR ENRTE TO JOHN WAYNE; NOT VAN NUYS. THE CLRNC HAD BEEN ISSUED ACCORDINGLY. FROM THIS EXPERIENCE I LEARNED: PAY FULL ATTN WHEN REQUESTING AND RECEIVING THE CLRNC. I SHOULD HAVE DELAYED PROGRAMMING THE FMS UNTIL AFTER I RECEIVED MY CLRNC; AND NOT DURING RECEIPT. (I HEARD WHAT I WANTED TO HEAR.) REPEAT BACK THE CLRNC LIMIT WHEN READING BACK THE CLRNC. I USUALLY DO THIS; BUT IN THIS CASE I DID NOT. HAD I STARTED WITH 'CLRED TO VAN NUYS VIA...' THE ERROR WOULD HAVE BEEN DETECTED UP FRONT.