Narrative:

Approaching runway 25R, tower cleared us (air carrier ab xyz) for takeoff. We began our takeoff roll when we heard the tower advise air carrier circuit breaker xyz to hold short of 25R after landing. He was landing on 25L. The first officer was making the takeoff and because of the common flight number he hesitated very briefly advancing power levers until I mentioned the transmission was not for us. As we were accelerating, I noticed circuit breaker xyz turning off 25L at a fairly rapid speed and thought he might not be stopping short of our runway. I watched him and at about 115 KTS it was clear to me circuit breaker xzy wasn't stopping, so I aborted the takeoff. At about the same moment circuit breaker xyz made an abrupt stop with his nose slightly extending onto runway 25R. We stopped short of his position and without incident. Circuit breaker xyz commented to tower that they thought they had been cleared to cross runway 25R. My discussion with the tower did not indicate any mistake or misunderstanding on our part, however, the common flight number certainly caused us some hesitation by way of possible misunderstanding. This certainly could have been responsible for circuit breaker xyz mistake. There is significant potential for misunderstandings and errors with common or similar flight numbers on frequency. Some type of monitoring and contact with the affected air carriers involved should be done by the ATC facilities.

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Original NASA ASRS Text

Title: ACR ON TKOF ROLL SEES ACR WITH IDENTICAL CALL SIGN FAIL TO HOLD SHORT OF RWY. TKOF ABORTED.

Narrative: APCHING RWY 25R, TWR CLRED US (ACR AB XYZ) FOR TKOF. WE BEGAN OUR TKOF ROLL WHEN WE HEARD THE TWR ADVISE ACR CB XYZ TO HOLD SHORT OF 25R AFTER LNDG. HE WAS LNDG ON 25L. THE FO WAS MAKING THE TKOF AND BECAUSE OF THE COMMON FLT NUMBER HE HESITATED VERY BRIEFLY ADVANCING PWR LEVERS UNTIL I MENTIONED THE XMISSION WAS NOT FOR US. AS WE WERE ACCELERATING, I NOTICED CB XYZ TURNING OFF 25L AT A FAIRLY RAPID SPD AND THOUGHT HE MIGHT NOT BE STOPPING SHORT OF OUR RWY. I WATCHED HIM AND AT ABOUT 115 KTS IT WAS CLR TO ME CB XZY WASN'T STOPPING, SO I ABORTED THE TKOF. AT ABOUT THE SAME MOMENT CB XYZ MADE AN ABRUPT STOP WITH HIS NOSE SLIGHTLY EXTENDING ONTO RWY 25R. WE STOPPED SHORT OF HIS POS AND WITHOUT INCIDENT. CB XYZ COMMENTED TO TWR THAT THEY THOUGHT THEY HAD BEEN CLRED TO CROSS RWY 25R. MY DISCUSSION WITH THE TWR DID NOT INDICATE ANY MISTAKE OR MISUNDERSTANDING ON OUR PART, HOWEVER, THE COMMON FLT NUMBER CERTAINLY CAUSED US SOME HESITATION BY WAY OF POSSIBLE MISUNDERSTANDING. THIS CERTAINLY COULD HAVE BEEN RESPONSIBLE FOR CB XYZ MISTAKE. THERE IS SIGNIFICANT POTENTIAL FOR MISUNDERSTANDINGS AND ERRORS WITH COMMON OR SIMILAR FLT NUMBERS ON FREQ. SOME TYPE OF MONITORING AND CONTACT WITH THE AFFECTED AIR CARRIERS INVOLVED SHOULD BE DONE BY THE ATC FACILITIES.

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.