2 air carrier mlgs in operation at lax with the same flight number. One departure and one arriving. The arrival flight was late, the departure flight had a new flight number assigned by dispatcher but dispatch had failed to coordinate with clearance delivery. Flight crew failed to note the newly assigned flight number when signing the release. Tower was confused.

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Attributes
ACN	370634
Time
Date	199705
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : holding ground other : taxi landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 250 flight time total : 5000 flight time type : 3000
ASRS Report	370634
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence other other anomaly other
Independent Detector	other controllera other flight crewa other other : unspecified
Resolutory Action	controller : issued new clearance flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Scheduled flight number was changed from abxy to agxy. I believe there was a change of tail numbers because the originating flight abxy was late. The problem arose when our flight abxy was holding short of runway 24L at lax as the late flight abxy was landing runway 24R and holding short of runway 24L downfield. Although the flight number changed on the release, dispatch failed to notify the pilots on our crew, and los angeles clearance delivery. Also, our operations agent failed to notify us. Our first indication was both flts being contacted by lax tower with some confusion on tower frequency.

Original NASA ASRS Text

Title: 2 ACR MLGS IN OP AT LAX WITH THE SAME FLT NUMBER. ONE DEP AND ONE ARRIVING. THE ARR FLT WAS LATE, THE DEP FLT HAD A NEW FLT NUMBER ASSIGNED BY DISPATCHER BUT DISPATCH HAD FAILED TO COORDINATE WITH CLRNC DELIVERY. FLC FAILED TO NOTE THE NEWLY ASSIGNED FLT NUMBER WHEN SIGNING THE RELEASE. TWR WAS CONFUSED.

Narrative: SCHEDULED FLT NUMBER WAS CHANGED FROM ABXY TO AGXY. I BELIEVE THERE WAS A CHANGE OF TAIL NUMBERS BECAUSE THE ORIGINATING FLT ABXY WAS LATE. THE PROB AROSE WHEN OUR FLT ABXY WAS HOLDING SHORT OF RWY 24L AT LAX AS THE LATE FLT ABXY WAS LNDG RWY 24R AND HOLDING SHORT OF RWY 24L DOWNFIELD. ALTHOUGH THE FLT NUMBER CHANGED ON THE RELEASE, DISPATCH FAILED TO NOTIFY THE PLTS ON OUR CREW, AND LOS ANGELES CLRNC DELIVERY. ALSO, OUR OPS AGENT FAILED TO NOTIFY US. OUR FIRST INDICATION WAS BOTH FLTS BEING CONTACTED BY LAX TWR WITH SOME CONFUSION ON TWR FREQ.

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.