Reported taxi across runway without clearance.

Attributes
ACN	100833
Time
Date	198812
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : stl
State Reference	MO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 400 flight time total : 23000 flight time type : 1050
ASRS Report	100833
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	incursion : runway other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

We landed on 12L told to hold short of 12R at bravo. After another aircraft landed and turned off, we heard xyz cleared to your gate. We answered xyz cleared across and crossed the 12R runway. On the other side, ground asked who cleared us across. I think the controller mixed up the flight numbers.

Original NASA ASRS Text

Title: REPORTED TAXI ACROSS RWY WITHOUT CLRNC.

Narrative: WE LANDED ON 12L TOLD TO HOLD SHORT OF 12R AT BRAVO. AFTER ANOTHER ACFT LANDED AND TURNED OFF, WE HEARD XYZ CLRED TO YOUR GATE. WE ANSWERED XYZ CLRED ACROSS AND CROSSED THE 12R RWY. ON THE OTHER SIDE, GND ASKED WHO CLRED US ACROSS. I THINK THE CTLR MIXED UP THE FLT NUMBERS.

Data retrieved from NASA's ASRS site as of August 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.