FLC OF AN ACR LGT ACFT DIVERTED FOR FUEL DUE TO INSUFFICIENT FUEL CAUSED BY DISPATCH ERROR.

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FLT PLAN FIGURED BY COMPUTER INPUT BY ME FOR FLT X WAS FOR ACFT X; AN MLG; WHEN IN REALITY FLT X WAS BEING FLOWN BY ACFT Y; AN MLG WITH A COMPUTERIZED FLT PLAN; SHOWING A BURN OF 8600 LBS. THIS COMPARES WITH A BURN OF 13600 LBS FOR LGT BOS-PIT ACFT Y; THE LGT SOME 5000 LBS DIFFERENCE. THE MISTAKE WAS NOT CAUGHT BY THE STATION PERSONNEL; THE CAPT OR BY MYSELF; THE DISPATCHER. THE MISTAKE WAS NOT FOUND UNTIL FLT WAS AIRBORNE AND WAS FURTHER COMPOUNDED BY LENGTHY TAXI DELAY AND ENRTE WX. FLT WAS NOT ALLOWED TO FLY FLT PLAN DUE TO ATC FACTORS CAUSED BY WX WHICH TOOK FLT 240-270 MI OFF RTE CLOSE TO DCA CONTRIBUTING TO X DIVERTING TO MDT FOR FUEL. AS GRIEVOUS AS THE MISTAKES WERE; HAD FLT X BEEN ALLOWED TO FLY FLT PLAN TO PIT; FLT WOULD HAVE TERMINATED AS SCHEDULED IN PIT; SO SAFETY WAS NOT COMPROMISED OR JEOPARDIZED. NOR WAS SAFETY A CONCERN WITH ENRTE DEVS CAUSED BY ATC AS THERE WERE NUMEROUS ARPTS TO LAND SHORT; INCLUDING ABE; EWR; PHL; BWI; IAD; DCA AND FINALLY; MDT; WHICH WAS CHOSEN. FLT X LANDED MDT WITH 10000 LBS OR MORE ON BOARD; WHICH IS MY NORMAL ARR FUEL FOR NORMAL LGT TRIPS. FLT X WAS FUELED IN MDT AND PROCEEDED TO PIT WITH A 1:18 DELAY. TO REITERATE; THE PROB WAS BEGUN BY MY INATTENTIVENESS TO DETAIL WITH SIMILAR ACFT NUMBERS (X AND Y) DETERMINING ACCURATE FUEL BURNS AND AGAIN BY MY NOT CHKING FIGURES ON RELEASE FOR THE NUMBERS. I LOOK AT 50-60 TIMES A DAY. THINKING BACK TO FIRST SEEING THE FLT PLAN; THE FIGURES DIDN'T LOOK FAMILIAR. THE ARR FUEL FIGURED FOR ACFT MLG WAS AROUND 12500 LBS FOR PIT; WHICH WAS CLOSE TO WHAT I WOULD HAVE PLANNED FOR THE LGT CONSIDERING TAXI TIME AND MINOR ENRTE DEVS; BUT IT STILL DID NOT SEEM ABNORMAL LOOKING AT THE FIGURES.