A DASH 8 WAS PREFLT CHKED; PAX BOARDED AND FLOWN TO TRIP TERMINATION WHERE IT WAS DISCOVERED THE WRONG AIRPLANE WAS TAKEN.

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BASICALLY WHAT HAPPENED IS THAT WE PREFLTED THE WRONG ACFT AND FLEW IT TO OUR DEST. IT WAS THE LAST DAY OF A 3 DAY TRIP AND WE SHOWED IN ROC AT XA30. OUR COMPANY NORMALLY OVERNIGHTS ONLY 1 ACFT IN ROC. WHEN WE SHOWED UP AT THE NORMAL GATE THAT DISPLAYED OUR FLT TO BWI; THE GATE AGENTS MET US WITH THE PAPERWORK AND ASKED WHAT TIME WE WANTED TO START BOARDING. WE PROCEEDED TO THE ACFT AND PREFLTED IT; BOARDED; AND FLEW TO BWI. UPON ARR AT BWI; OPS QUESTIONED US AS TO WHICH ACFT WE WERE FLYING. WE THEN REALIZED WE WERE IN THE WRONG ACFT. DURING PREFLT; I REVIEWED OUR FLT RELEASE AS NORMAL; BUT I FAILED TO CATCH IT WAS THE WRONG ACFT. NOTHING LED ME TO DOUBT IT WAS THE WRONG ACFT -- ONLY 1 ACFT ON THE GATE; THE GATE DISPLAYED OUR FLT; THE AGENTS KNEW WE WERE GETTING ON THE ACFT AND ASKED WHEN WE WOULD BE READY. BAD WX THE NIGHT BEFORE RESULTED IN 2 DIVERSIONS INTO ROC AND 3 OF OUR ACFT OVERNIGHTED. THE OTHER TWO WERE REMOTE PARKED AT ANOTHER LOCATION; BUT WE WERE NEVER INFORMED OF THIS FACT. HAD I SEEN MORE THAN 1 ACFT ON THE RAMP; I SURELY WOULD HAVE ASKED TO MAKE SURE WE WERE ON THE RIGHT ACFT.