ACR WDB LANDED AT LGA WITH 3600 POUNDS FUEL REMAINING.

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AIRLINE FLT ARRIVING LGA FROM MIA; 7/88; A WDB. LANDED WITH SLIGHTLY UNDER 4000# FUEL; A LESS THAN ADEQUATE AMOUNT FOR THIS TYPE ACFT. THE PROB AROSE WITH TSTMS IN THE NY AREA CAUSING AIR TFC DELAYS. AFTER A GATE HOLD OF NEARLY 1 HR ON THE GND IN MIA; WE PROCEEDED ENRTE WITH 51300 LBS OF FUEL; A NORMAL AMOUNT. BUT AT TAR RIVER VOR WE WERE CLRED TO HOLD FOR APPROX 45 MINS. SUBSEQUENTLY WE WERE CLRED ON A CIRCUITOUS ROUTING OVER HARRISBURG; HANCOCK; KINGSTON AND THEN LGA. I TOLD THE CAPT THAT WE DID NOT HAVE ENOUGH FUEL TO GO THAT WAY; BUT HE CONTINUED. HE SAID THAT IF THE FUEL LEVEL GOT DOWN TO 10000#; HE WOULD LAND SOMEWHERE. HOWEVER; WHEN WE DID GET DOWN TO 10000# FUEL; THERE WAS NOT A GOOD ALTERNATE NEARBY AND WE WERE STILL ABOUT 100 MI FROM LGA. WE CONTINUED TO RECEIVE DELAYING VECTORS AND WERE GIVEN A LONG APCH AT LOW ALT. I BELIEVE WE SHOULD HAVE LANDED FOR FUEL; PROBABLY IN THE WASHINGTON AREA. I WISH I HAD MADE THIS RECOMMENDATION TO THE CAPT MORE FORCEFULLY AND BEEN MORE PERSUASIVE ABOUT THIS BEFORE OUR FUEL REACHED A CRITICAL LEVEL. SUPPLEMENTAL INFO FROM ACN 91402: PASSING AROUND WASHINGTON DC AREA; OUR FUEL STATE BECAME ONE OF OUR CONCERNS. I CALLED DISPATCH FOR DIRECTIONS OF ALTERNATE CHOICES; WHICH WERE LGA; JFK; PHL. PASSING W OF PHL I PICKED UP THEIR WX. ALL WERE ABOVE MINIMUMS; BUT WITH TSTMS IN THE AREA. WHEN THE FUEL GOT TO AROUND 10000#; WE WERE AT A POINT EQUIDISTANT FROM PHL AND LGA. I STATED THE FUEL LOAD AND ASKED IF WE WERE GOING TO PROCEED DIRECT TO LGA. ZNY SAID YES. CAPT DECIDED TO PROCEED. NO EMER WAS DECLARED.