Crj-200 flight crew is issued takeoff clearance with wrong call sign.

Attributes
ACN	700241
Time
Date	200606
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff ground : taxi ground : position and hold
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 80 flight time total : 1800 flight time type : 1500
ASRS Report	700241
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

We were departing to savannah; GA; late in the evening. We were first in line at the runway. I don't believe anyone was behind us. Tower said; 'air carrier Y position and hold runway 30.' we were air carrier X; so I said very clearly; 'position and hold runway 30; air carrier X.' I thought the controller made a mistake; so I read back our call sign very slow and clear. There was no response that we should not position and hold as air carrier X; so we did. Then we were cleared for takeoff as air carrier Y. I thought he made the same mistake; so I said slowly 'cleared for takeoff air carrier X.' no response that we should not take off; so we took off. At about 400 ft AGL the controller said; 'air carrier X; contact departure.' I said 'contact departure; air carrier X.' the controller said; 'who are you?' I said; 'air carrier X.' he said; 'where are you going?' I said 'savannah.' he said; 'I cleared air carrier Y to take off; I wish you would have told me; contact departure.' I will in the future make sure the controller knows who we are and says our call sign.

Original NASA ASRS Text

Title: CRJ-200 FLT CREW IS ISSUED TKOF CLRNC WITH WRONG CALL SIGN.

Narrative: WE WERE DEPARTING TO SAVANNAH; GA; LATE IN THE EVENING. WE WERE FIRST IN LINE AT THE RWY. I DON'T BELIEVE ANYONE WAS BEHIND US. TWR SAID; 'ACR Y POS AND HOLD RWY 30.' WE WERE ACR X; SO I SAID VERY CLRLY; 'POS AND HOLD RWY 30; ACR X.' I THOUGHT THE CTLR MADE A MISTAKE; SO I READ BACK OUR CALL SIGN VERY SLOW AND CLR. THERE WAS NO RESPONSE THAT WE SHOULD NOT POS AND HOLD AS ACR X; SO WE DID. THEN WE WERE CLRED FOR TKOF AS ACR Y. I THOUGHT HE MADE THE SAME MISTAKE; SO I SAID SLOWLY 'CLRED FOR TKOF ACR X.' NO RESPONSE THAT WE SHOULD NOT TAKE OFF; SO WE TOOK OFF. AT ABOUT 400 FT AGL THE CTLR SAID; 'ACR X; CONTACT DEP.' I SAID 'CONTACT DEP; ACR X.' THE CTLR SAID; 'WHO ARE YOU?' I SAID; 'ACR X.' HE SAID; 'WHERE ARE YOU GOING?' I SAID 'SAVANNAH.' HE SAID; 'I CLRED ACR Y TO TAKE OFF; I WISH YOU WOULD HAVE TOLD ME; CONTACT DEP.' I WILL IN THE FUTURE MAKE SURE THE CTLR KNOWS WHO WE ARE AND SAYS OUR CALL SIGN.

Data retrieved from NASA's ASRS site as of January 2009 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.