FLT CREW FAILED TO RETRACT WING FLAPS TO THE FULL UP POSITION AND A PASSENGER BUS HIT THE LEFT WING IN THE AREA OF THE EXTENDED FLAP.

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WX CONDITION CLR. ON APCH TO ILS 4R JFK FOLLOWING ACR WDB; DID NOT RECEIVE LNDG CLRNC UNTIL 100' BECAUSE WDB DID NOT EXIT RWY (HE COULD NOT FIND THE TXWY). TWR ASKED US TO TAKE IMMEDIATE HIGH SPD EXIT BECAUSE OF TFC BEHIND US WAS GETTING CLOSE ON FINAL. AFTER EXITING RWY TWR ASKED IF WE WERE ABLE TO TAKE A SHARP LEFT OFF THE HIGH SPD TAXI. BECAUSE OF SNOW BANKS AND ICE I WAS UNABLE TO MAKE THE LEFT. IT WAS AT THIS TIME MY COPLT WAS COMPLETING HIS AFTER LNDG CHKLIST AND I ASKED HIM TO SEE IF THE ACFT WOULD CLR THE SNOW BANK ON THE RIGHT SIDE. HIS RESPONSE WAS 'NO.' I THEN TOLD HIM TO INFORM ATC WE COULD NOT MAKE THE TURN SAFELY. CONCENTRATION FROM THE CHKLIST WAS DIVERTED. NEARING THE END OF THE AFTER LNDG CHKLIST; THE DIVERSION I FEEL CAUSED HIM TO OMIT RETRACTING THE FLAPS TO 0. AT THE GATE THE ACFT WAS SHUTDOWN; THE PAX DEPLANED AND I PREPARED TO LEAVE COCKPIT WHEN MY COPLT REALIZED THAT HE HAD NOT RETRACTED THE FLAPS DURING HIS SILENT AFTER LNDG CHKLIST. TO RETRACT THE FLAPS ONE ENG MUST BE RUNNING FOR HYD PRESSURE. I DEPARTED TO FIND A GND HANDLER TO RESTART ONE ENG. A PAX BUS WHICH NORMALLY WILL CLEAR THE WING WITH FLAPS UP XED UNDER OUR ACFT AND STRUCK THE PARTIALLY EXTENDED FLAPS. SUPPLEMENTAL INFO FROM ACN 80387: WE WERE GIVEN AN EXTREMELY LENGTHY TAXI AROUND THE ENTIRE OPP END OF THE ARPT; DURING THAT TIME THE CAPT INSTRUCTED ME TO MAKE NUMEROUS CALLS ON COMPANY FREQ; AND TO ALSO CHK WITH ATC PERTAINING TO ATC DELAYS FOR OUR OUTBND FLT; FURTHER DISTRACTING ME FROM MY NORMAL ASSIGNED DUTIES. WE WERE STRUCK BY AN ARPT BUS THAT WAS TAKING A SHORTCUT UNDER OUR LEFT OUTBOARD WING. THE BUSES ARE AT TIMES GREATLY UNAWARE OF THE EVER PRESENT DANGEROUS SITUATIONS THAT EXIST ON BUSY RAMP AREAS AND CONTINUE TO OPERATE IN RECKLESS MANNERS.