A B737 FLT IS DELAYED ON ITS ARR TO DEST ARPT WHILE THE FLC AND ATC ATTEMPT TO SORT OUT THE PROBS OF A GA ACFT THAT CAN'T COPE WITH THE RWY SELECTION AND PLT OPERATED LIGHTING SYS AT ZZZ; US.

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INSTRUCTED TO SLOW DUE TO GA ACFT AHEAD WITH INTENT TO LAND AT SAME DEST. THERE WAS A GREAT DEAL OF CONFUSION WITH ATC AND THE GA ACFT AS TO THE RWY LIGHTS NOT WORKING (CONTROL TWR CLOSED). GA ACFT WAS INTENDING TO LAND RWY 18/36; ALTHOUGH THERE IS NO PLT CTLED LIGHTING FOR THAT RWY. (RWY 9/27 IS PLT CTLED.) DUE TO THE INABILITY FOR THE GA ACFT TO FIND THE RWY; WE WERE CLRED TO THE OM THEN DIRECT TO THE FIELD. WE CALLED THE FIELD IN SIGHT APPROX 15 MI OUT. ATC INFORMED US OF THE TFC WHICH WE WERE TO FOLLOW. THE CAPT FLEW TO THE OM AT 3000 FT AND THEN BEGAN TO FLY THE APCH. WE CONTINUED TO LOOK FOR THE GA ACFT. THE CAPT FLEW THE APCH WHILE I LOOKED FOR THE TFC. AS WE DSNDED TO 1400 FT; ATC ADVISED US TO MAINTAIN 2000 FT. A GREAT DEAL OF TIME WAS SPENT LOOKING FOR THE GA ACFT AND LISTENING TO HIS CONFUSION OF ARPT LIGHTING. THE CAPT AND I DISCUSSED AS TO WHETHER OR NOT WE WERE CLRED FOR A VISUAL APCH. THE GA ACFT LANDED BUT NOT BEFORE WE HAD TO DO A GAR. WE WERE THEN CLRED FOR THE VISUAL. TOO MUCH TIME WAS SPENT BY ATC AND OURSELVES TO THE GA ACFT. THE INEXPERIENCE OF THE GA PLT WITH ARPT CONDITIONS LED TO A GREAT NUMBER OF DISTRS. ARPT LIGHTING WAS IN GOOD WORKING CONDITION.