2 air carrier aircraft had the same number.

Attributes
ACN	275182
Time
Date	199406
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	ground : holding
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff ground : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	275182
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Similar call sign potential conflict. Departing ord at XX45 local. Air carrier a cleared position and hold runway 32R for approximately 3 min. Air carrier X was cleared position and hold runway 4L not knowing air carrier a was in position first. Tower cleared air carrier X to depart first. Potential for both aircraft to accept a takeoff clearance on intersecting runways at the same time existed.

Original NASA ASRS Text

Title: 2 ACR ACFT HAD THE SAME NUMBER.

Narrative: SIMILAR CALL SIGN POTENTIAL CONFLICT. DEPARTING ORD AT XX45 LCL. ACR A CLRED POS AND HOLD RWY 32R FOR APPROX 3 MIN. ACR X WAS CLRED POS AND HOLD RWY 4L NOT KNOWING ACR A WAS IN POS FIRST. TWR CLRED ACR X TO DEPART FIRST. POTENTIAL FOR BOTH ACFT TO ACCEPT A TKOF CLRNC ON INTERSECTING RWYS AT THE SAME TIME EXISTED.

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.