CHAOTIC BOARDING DUE TO ACCOMMODATING PAX FROM A CANCELLED FLT RESULTS IN INCORRECT TKOF WTS FOR MD80 FLT CREW.

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ON ARR WE WERE INFORMED OF A MECHANICAL ON ANOTHER FLT AND THAT THOSE PAX MAY GO WITH US. THE ACTUAL BOARDING PROCESS FOR OUR FLT WAS SLOW AND CHAOTIC. I TALKED WITH THE AGENTS AND TOLD THEM TO TAKE THE TIME THEY NEEDED TO GET EVERYBODY ON BOARD. I FURTHER EXPLAINED WE WOULD GO WHEN THEY WERE READY. AS WE FINISHED UP OUR CHKLISTS AND OTHER DUTIES WE RECEIVED OUR LOAD CLOSE OUT. AT ABOUT THAT MOMENT; THE AGENT APPEARED AND INFORMED ME THAT THEY HAD RECEIVED A CALL FROM LOADS AND WERE INSTRUCTED TO GET THE PLANE OUT SO NO MORE PAX WOULD BE BOARDED. I REMINDED HER TO CHK OUR CLOSE OUT AND TO SEND THE NEW DATA IN AND WE WOULD RETRIEVE IT VIA ACARS. WE PUSHED; STARTED; TAXIED AND SENT FOR A NEW CLOSE OUT. OUR ORIGINAL. WE FIGURED THIS WAS CORRECT BECAUSE THE AGENT HAD EXPLAINED NOBODY ELSE WOULD BE BOARDED. AFTER TKOF; WE RECEIVED THE MESSAGE DELETING OUR CLOSE OUT. OUR CLOSE OUT WAS REVISED AND WE CONTINUED TO DFW.SUPPLEMENTAL INFO FROM 723700: I RECEIVED THE MESSAGE 14 MINUTES AFTER THE FLT WAS IN THE AIR. THE INITIAL CLOSEOUT HAD SHOWN 102 PAX. AFTER A CALL FROM PSP AGENTS TO LOAD AGENT; A REVISED CLOSEOUT FOR 121 PAX WAS SENT TO THE FLT.