Two medium large transport aircraft same company similar identify on parallel runway in takeoff position. XXX cleared for takeoff. After airborne noticed other medium large transport xxy in simultaneous takeoff and climb.

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Attributes
ACN	147880
Time
Date	199006
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dal
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dal
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 280 flight time total : 10200 flight time type : 4500
ASRS Report	147880
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	conflict : airborne less severe incursion : runway other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our aircraft, flight XXX was cleared into position and hold on runway 13R. Approximately one min later, company flight xxy was cleared into position and hold on runway 13L. Approximately one min later tower cleared 'flight XXX for takeoff runway 13R'. We read back the clearance using proper terminology and began our takeoff. After takeoff, we noticed company flight climbing off the other runway abeam us and at the same altitude. Normally departures are staggered, so we knew somebody had rogered the wrong call sign and the transmission had been blocked by the other aircraft. We were aware that company flight xxy was on frequency and in position on the other runway, however tower did not mention that similar call signs were on frequency and in position for takeoff. We believe the other aircraft rogered our clearance, but we could have made the same mistake had we not been aware of the other aircraft's presence. Both tower and the other aircraft should have been more heads up.

Original NASA ASRS Text

Title: TWO MLG ACFT SAME COMPANY SIMILAR IDENT ON PARALLEL RWY IN TKOF POSITION. XXX CLEARED FOR TKOF. AFTER AIRBORNE NOTICED OTHER MLG XXY IN SIMULTANEOUS TKOF AND CLIMB.

Narrative: OUR ACFT, FLT XXX WAS CLRED INTO POS AND HOLD ON RWY 13R. APPROX ONE MIN LATER, COMPANY FLT XXY WAS CLRED INTO POS AND HOLD ON RWY 13L. APPROX ONE MIN LATER TWR CLRED 'FLT XXX FOR TKOF RWY 13R'. WE READ BACK THE CLRNC USING PROPER TERMINOLOGY AND BEGAN OUR TKOF. AFTER TKOF, WE NOTICED COMPANY FLT CLBING OFF THE OTHER RWY ABEAM US AND AT THE SAME ALT. NORMALLY DEPS ARE STAGGERED, SO WE KNEW SOMEBODY HAD ROGERED THE WRONG CALL SIGN AND THE XMISSION HAD BEEN BLOCKED BY THE OTHER ACFT. WE WERE AWARE THAT COMPANY FLT XXY WAS ON FREQ AND IN POS ON THE OTHER RWY, HOWEVER TWR DID NOT MENTION THAT SIMILAR CALL SIGNS WERE ON FREQ AND IN POS FOR TKOF. WE BELIEVE THE OTHER ACFT ROGERED OUR CLRNC, BUT WE COULD HAVE MADE THE SAME MISTAKE HAD WE NOT BEEN AWARE OF THE OTHER ACFT'S PRESENCE. BOTH TWR AND THE OTHER ACFT SHOULD HAVE BEEN MORE HEADS UP.

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.