2 different air carrier's on same route with exactly the same flight #.

Attributes
ACN	179247
Time
Date	199105
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zau
State Reference	IL
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff cruise other landing other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff cruise other landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 4000 flight time type : 600
ASRS Report	179247
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Air carrier a flight 123 and air carrier B flight 123 were ont he same route form ord to lax. Although the controllers were excellent about notifying us of each other's presence, there were still times when it was difficult to tell which clearance was for which aircraft. There should be enough flight #south to go around to prevent this duplication of call sign on identical rtes.

Original NASA ASRS Text

Title: 2 DIFFERENT ACR'S ON SAME ROUTE WITH EXACTLY THE SAME FLT #.

Narrative: ACR A FLT 123 AND ACR B FLT 123 WERE ONT HE SAME RTE FORM ORD TO LAX. ALTHOUGH THE CTLRS WERE EXCELLENT ABOUT NOTIFYING US OF EACH OTHER'S PRESENCE, THERE WERE STILL TIMES WHEN IT WAS DIFFICULT TO TELL WHICH CLRNC WAS FOR WHICH ACFT. THERE SHOULD BE ENOUGH FLT #S TO GO AROUND TO PREVENT THIS DUPLICATION OF CALL SIGN ON IDENTICAL RTES.

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.