A300 PLT CLAIMS THAT RESERVE ASSIGNMENT FOR INTERNATIONAL TRIP WAS UNSAFE DUE TO LONG LATE ASSIGNMENT AND PRECEDING DEADHEAD. REFUSED FLT DUE TO FATIGUE.

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AT XA30 I WAS ASSIGNED A FLT SEQUENCE TO DEADHEAD TO ZZZ AND DEPART ZZZ AT XI55 FOR A 5 HR 25 MIN ALL-NIGHT FLT TO ZZZ2. I DEPARTED MY HOUSE AROUND XB15. IT TOOK ALMOST 3 HRS FOR THE NORMAL 1 HR 45 MIN DRIVE TO ZZZ2 DUE TO TFC; FOG AND RAIN. ON THE WAY TO THE ARPT; I CALLED BOTH CREW SCHEDULERS AND THE CHIEF PLT ON CALL; ASKING THAT I BE ASSIGNED A FIRST CLASS SEAT SO THAT I COULD GET SOME REST. BOTH WERE VERY NICE; BUT SAID THEY WERE UNABLE TO DO THAT. I SIGNED IN AT XE30; BUT WE WERE DELAYED UNTIL XF48 DUE TO A LATE ARRIVING CREW. IT WAS A BUMPY RIDE ALL THE WAY TO ZZZ; AND I WAS UNABLE TO SLEEP AT ALL. THERE WAS NO WAY IT WAS SAFE FOR ME TO REMAIN AWAKE FOR ANOTHER 7 HRS FOR PREFLT AND THE FLT TO ZZZ2 SO I CALLED TRACKING AND TOLD THEM I WAS FATIGUED. AT THAT POINT; I HAD BEEN AWAKE SINCE XR30 AND WAS LOOKING AT A 23 HR DAY. THIS SEQUENCE WOULD NOT HAVE BEEN LEGAL IF IT WERE DOMESTIC; SO IT SHOULD NOT HAVE BEEN LEGAL JUST BECAUSE IT WAS INTL. IN THE INTERESTS OF SAFETY; WE NEED TO IMPLEMENT AN INTL RESERVE REST POLICY WHICH MIRRORS THE CURRENT FARS WITH REGARD TO LOOK BACK REST.