ALT XING RESTR NOT MET AT BRAND INTXN BY THE FLC OF AN MD88 IN DSCNT ON THE KORRY 1 ARR PROC TO LGA; NY.

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I WAS FLYING AS FO ON FLT FROM ATL TO LGA. WE WERE ON THE KOREY 1 ARR; TALKING TO CTR. WE WERE GIVEN A DSCNT CLRNC FROM CRUISE TO A LOWER ALT. THEN OUR NEXT CLRNC WAS TO DSND 'VIA' THE KOREY 1. THE CAPT WAS TALKING TO THE JUMP SEATER AND MISSED THE CLRNC SO I HAD TO REPEAT IT. WE HAD THE ARR IN THE FMS AND STARTED THE DSCNT TO COMPLY WITH THE MANY STEPDOWN FIXES ON THE ARR; I RECOMMENDED WE USE THE VNAV FUNCTION OF THE AUTOPLT WHICH WILL COMPLY WITH THE ALT AUTOMATICALLY. THE CAPT CHOSE TO USE VERT SPD FOR THE DSCNT PROFILE. ATC GAVE US A FREQ CHANGE AND IN DOING SO I LOOKED DOWN TO CHANGE FREQS. AS I CHKED OUR DSCNT PROGRESS; I REALIZED WE WERE GOING TO BE TOO HIGH TO MEET THE 13000 FT RESTR AT XYZ INTXN. ALSO; LEAVING US TO BE HIGH AT THE NEXT INTXN. I BELIEVE SITUATIONAL AWARENESS AND THE JUMP SEATER AS A DISTR IN THE COCKPIT WERE CONTRIBUTING FACTORS IN THIS SIT. ALSO; THAT ARR IS FAIRLY NEW AND IN OUR COMPANY NOTAMS ON OUR FLT PLAN. THEY GIVE US A HEADS UP ABOUT THE ARR BEING VERY TIGHT IN REGARD TO THE VERT NAV XING RESTRS. WE ALSO HAD A FAIRLY LARGE TAILWIND.