A B727 IS INADVERTENTLY REFUELED; BUT DETERMINED BY THE CREW ON TAXI OUT TO BE WITHIN LIMITS FOR TKOF. DURING CRUISE; THE CREW REALIZED THEY WOULD BE TOO HVY TO LAND AT DEST AND WERE REQUIRED TO BURN THE EXCESS FUEL INFLT.

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WE BROUGHT ACFT X (A B727) INBOUND TO ZZZ TO MAKE UP FLT FROM ZZZ. THE ACFT WAS PROPERLY FUELED TO THE CORRECT FUEL LOAD AND VERIFIED BY THE SO. THE PREFLT CHKLIST WAS ACCOMPLISHED AND THE FUEL LOAD VERIFIED AGAIN AS PER SOP. AT THIS TIME WE WERE ADVISED BY MAINT THAT A SVC CHK WOULD BE DONE ON THE ACFT AND WOULD REQUIRE AN HR TO PERFORM. WE ELECTED TO GO INTO THE TERMINAL TO GET SOMETHING TO EAT. SUBSEQUENTLY; THE FUELER RETURNED TO FUEL HIS NEXT FLT AT THAT GATE (ALSO A B727); THINKING OUR PLANE HAD ALREADY LEFT AND BEEN REPLACED WITH HIS NEXT PLANE. AN ADDITIONAL 6000 LBS OF FUEL WAS ADDED FOR THE NEEDED FUEL ON THE NEXT FLT AFTER OURS; GOING TO ZZZ2; NOT ZZZ1. ON TAXI OUT; WE NOTICED THE INCREASED FUEL; CONFIRMED WITH DISPATCH AND FIGURED OUT WHAT HAPPENED. WE CHKED OUR PERFORMANCE NUMBERS AND WERE WITHIN LIMITS FOR TKOF. DURING CRUISE; WE REALIZED WE WERE TOO HVY TO LAND AT ZZZ1 WITH THE INCREASED FUEL LOAD. WE EXPLAINED THE PROB WITH DISPATCH AND AGREED TO BURN THE EXCESS FUEL INFLT. ONCE WE BURNED THE EXTRA FUEL; WE WERE THEN DOWN TO OUR MAX LNDG WT AND MADE A NORMAL LNDG WITHOUT INCIDENT. I NOW XCHK MY TKOF AND LNDG WT BEFORE EVERY TKOF.