RPTR ERROR ADMITTED WHEN AN EMBARRASSED MD80 PIC AND FO RPT ON FAILING TO SHUT DOWN #1 ENG AFTER ARRIVING AT THE GATE IN ORD; IL.

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I JUST RECEIVED A CALL FROM UNION SAFETY; THAT I NEGLECTED TO SHUT DOWN AN ENG FOLLOWING GATE ARR IN ORD. I DON'T REMEMBER NOT SHUTTING DOWN THE ENG. BUT MY FO AND I WERE IN A RUSH TO GO FROM ONE GATE TO ANOTHER GATE TO CONNECT FOR OUR FINAL FLT OF THE SEQUENCE HOME. IT IS HORRIBLY EMBARRASSING TO REALIZE THAT THIS IS POSSIBLE. I AM A VERY METHODICAL CHKLIST PERSON; BUT I GUESS IT HAPPENED. WE WERE DELAYED IN ZZZ WAITING FOR THE ACFT TO ARRIVE. FINALLY GETTING AIRBORNE FOR ORD; WE REALIZED OUR CONNECTION WAS GOING TO BE CLOSE. SINCE WE WERE SCHEDULED TO DEADHEAD; I INSTRUCTED THE FO TO HURRY DOWN TO THE GATE TO GET US CHKED IN. THE LAPSE IS ENTIRELY MY FAULT. A COUPLE OF THINGS WERE HAPPENING; BUT THE BOTTOM LINE IS THAT WE WERE RUSHING; AND NEGLECTED TO FINISH THE CHKLIST. I ALWAYS TELL FO'S NOT TO RUSH; BECAUSE THEY WILL MAKE MISTAKES. IT IS VERY EMBARRASSING TO HAVE THIS HAPPEN TO ME. THE WORST THING THAT COULD HAVE HAPPENED IS THAT WE WOULD HAVE MISSED OUR DEADHEAD; WHICH WE DID. SUPPLEMENTAL INFO FROM ACN 575478: THE CAPT AND I FLEW THE ENTIRE MONTH TOGETHER; AS WELL AS ON OTHER OCCASIONS. I AM QUITE FAMILIAR WITH THE CAPT'S HABIT PATTERNS. OUR AFTER LNDG HABIT PATTERNS CHANGED A GREAT DEAL DURING OUR LAST TRIP; DUE TO A JUMPSEAT CONVERSATION WITH THE FLT OPS TECHNICAL REPRESENTATIVE; WHO EMPHASIZED FUEL SAVINGS BY NOT BRINGING UP THE APU ON TAXI IN; BUT INSTEAD ROLLING IN ON 1 ENG. WE TRIED IT EACH LEG THEREAFTER. UNFORTUNATELY; THIS CHANGED OUR HABIT PATTERN WHEN IN THE CHOCKS. PREVIOUSLY; WE WOULD 'CUT #2; CUT #1' ON APU; THEN RUN THE CHKLIST. WE HAVE BOTH DONE THIS FOR YRS. WITH ONLY #1 RUNNING; THERE IS SOMETIMES A VERY LONG WAIT UNTIL GND PWR IS ESTABLISHED. IT WAS DURING THIS LONG WAIT THAT HABIT PATTERNS WERE INTERRUPTED AND THE SHUTDOWN WAS MISSED ALTOGETHER.