Narrative:

We were scheduled to depart tcl for pib as flight #X. This flight is a continuation of a previous flight from atl to tcl, also flight #X previous flight was late and had no passengers continuing to pib, so we were to depart on time. On climb out, tower told us bhm approach was working our other flight with the same number, so we called ourselves #Y. I had never had this situation occur before. Next time I'll know to alter our number before we takeoff in similar situation.

Google
 

Original NASA ASRS Text

Title: ACR SMT ACFT WITH 'SAME FLT NUMBER' AS ANOTHER COMPANY ACFT.

Narrative: WE WERE SCHEDULED TO DEPART TCL FOR PIB AS FLT #X. THIS FLT IS A CONTINUATION OF A PREVIOUS FLT FROM ATL TO TCL, ALSO FLT #X PREVIOUS FLT WAS LATE AND HAD NO PAXS CONTINUING TO PIB, SO WE WERE TO DEPART ON TIME. ON CLBOUT, TWR TOLD US BHM APCH WAS WORKING OUR OTHER FLT WITH THE SAME NUMBER, SO WE CALLED OURSELVES #Y. I HAD NEVER HAD THIS SITUATION OCCUR BEFORE. NEXT TIME I'LL KNOW TO ALTER OUR NUMBER BEFORE WE TKOF IN SIMILAR SITUATION.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.