Tower controller was apparently confused regarding an air carrier medium large transport call sign which they believed did not exist and gave what they thought was the correct number.

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Attributes
ACN	318650
Time
Date	199510
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ind
State Reference	IN
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ind tower : agc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 18000 flight time type : 4000
ASRS Report	318650
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

We were cleared for takeoff as air carrier flight xx. Tower then told us to switch to departure control, but used air carrier flight xy, as call sign. When queried, he stated that xx did not exist. We switched to departure control anyway and all was normal. We suspect that tower got confused since flight xy does not exist according to us. It was our fourth leg on a 7:30 flight time and 13 hour day, so we were tired.

Original NASA ASRS Text

Title: TWR CTLR WAS APPARENTLY CONFUSED REGARDING AN ACR MLG CALL SIGN WHICH THEY BELIEVED DID NOT EXIST AND GAVE WHAT THEY THOUGHT WAS THE CORRECT NUMBER.

Narrative: WE WERE CLRED FOR TKOF AS ACR FLT XX. TWR THEN TOLD US TO SWITCH TO DEP CTL, BUT USED ACR FLT XY, AS CALL SIGN. WHEN QUERIED, HE STATED THAT XX DID NOT EXIST. WE SWITCHED TO DEP CTL ANYWAY AND ALL WAS NORMAL. WE SUSPECT THAT TWR GOT CONFUSED SINCE FLT XY DOES NOT EXIST ACCORDING TO US. IT WAS OUR FOURTH LEG ON A 7:30 FLT TIME AND 13 HR DAY, SO WE WERE TIRED.

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.