ACR MLG FAILED TO KEEP A COPY OF THE DISPATCH RELEASE ON THE ACFT WHEN DEPARTING ATL FROM A QUICK TURN.

Narrative

OUR FLT WAS LATE ARRIVING INTO ATL DUE TO DELAY IN MKE (DEP POINT). SINCE WE WERE ARRIVING AROUND OUR NORMAL DEP TIME; WE DID A QUICK TURN TO TRY TO MAKE UP TIME BACK TO MKE. WHILE I (FO) DID WALK AROUND; CAPT GOT ATIS AND CLRNC AND FILLED OUT WT AND BAL SHEET (NORMALLY DONE BY FO). I RETURNED; COPIED HIS NUMBERS; CHKED ADDITION ON LOAD SHEET; CHKED THAT CAPT SIGNED RELEASE AND PUT EVERYTHING ON CLIPBOARD AND HANDED TO GATE AGENT. PUSHBACK; TAXI; AND TKOF WAS NORMAL. WE WERE ON A HDG FROM CENTER WHEN NEXT SECTOR CLRED US TO INTERCEPT J89 (NORMAL COURSE) THEN CHANGED IT TO DIRECT CHA-BNA ON COURSE. WE QUESTIONED IT; THEN REALIZED WE LEFT BOTH RELEASES IN ATL. WE WORKED OUT RTING WITH CENTER TO J89 IIU (LOUISVILLE); WHICH IS OUR NORMAL COURSE; WITH NO PROBLEMS AND PROCEEDED ON COURSE AS NORMAL. EVIDENTLY WHEN I CHKED LOAD SHEET I PUT RELEASE ON CLIPBOARD JUST OUT OF HABIT WHEN CAPT HAD ALREADY DONE IT. AND THAT WAS FIRST TIME EITHER OF US HAD EVER GOT THE RTING OVER BNA. PLUS THE RUSH OF A QUICK TURN CONTRIBUTED. UNFORTUNATELY; WE WORKED THE FLT OUT OF HABIT AND ROUTINE WHEN AT THE TIME AT THE GATE IT WAS ABNORMAL. IT SHOWS HOW IMPORTANT CREW COORD IS AT ALL TIMES AND NOT TO BE LULLED INTO COMPLACENCY BY HABIT. JUST GOING THROUGH THE MOTIONS DOESN'T WORK.