CHICAGO, IL, USA
N224AA
MCDONNELL DOUGLAS DC-9-82
AMERICAN FLT 637 WAS ON DEPARTURE FROM CHICAGO-O'HARE INTL ARPT (ORD), CLIMBING THRU 7300' MSL, WHEN IT PASSED AMERICAN FLT 393 WITH APRX 500' VERTICAL SEPN & 1/4 MI HORIZONTAL SEPN. THIS OCCURRED AFTER AN AIR TRAFFIC ASSISTANT, WHO WAS WORKING THE CLNC DELIVERY PSN AT ORD, HAD ISSUED THE SAME TRANSPONDER CODE TO FLT 637 & UNITED FLT 441. SUBSEQUENTLY, A TRAINEE CONTROLLER (CTLR), WHO WAS WORKING AT THE WEST DEPARTURE RADAR CONTROL POSITION, MISTOOK FLT 441'S TARGET AS THAT OF FLT 637 & ISSUED CLIMB INSTRUCTIONS TO FLT 637. THE INSTRUCTOR DID NOT RECOGNIZE THE ERROR IN TIME TO CORRECT THE CTLR'S ACTION.
Source: NTSB Aviation Accident Database
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