NEW YORK AREA HELI PLT ADDRESSES THE PROB OF 'POP-UP TFR'S' AND THE DIFFICULTY FOR USERS TO PROPERLY INFORM THEMSELVES OF THE EXISTENCE AND EXTENT OF SAME.

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HAD NUMEROUS FLTS BTWN HPN AND NEW YORK CITY HELIPORT 6N5 FROM XA00-XF30. HAD A WX BRIEFING AND CALLED FSS FOR TFR'S IN THE AREA. NO TFR'S WERE POSTED. THE ONLY TFR WAS A PREVIOUS ONE EARLY IN 2003 ABOUT SPORTING EVENTS WILL IMPLEMENT TFR'S 1 HR BEFORE UNTIL 1 HR AFTER AN EVENT FOR A RESTR 3000 FT AND 3 MI. ONE OF MY FLTS BTWN HPN AND 6N5 WE FLEW S ON HUDSON RIVER AND GOT A CLRNC FOR 'HARLEM RTE' SBOUND TO 6N5. WE NOTICED A GAME WAS PLAYING; BUT LGA CTL CLRED US THROUGH. ON THE RETURN TRIP FROM 6N5 TO HPN; WE CALLED LGA CTL FOR THE SAME 'HARLEM RTE' NBOUND TO HPN. HE DENIED IT DUE TO TFR FOR GAME; AND WE WERE GIVEN THE 'THROGGS RTE.' THESE 'POP UP' TFR'S ARE A HIGH RISK OF GETTING A VIOLATION AS A PLT. EVEN CALLING PRIOR TO A FLT IS NO GUARANTEE OF KNOWING WHEN THESE TFR'S POP UP WHILE YOU ARE ENRTE. THERE IS NO WAY TO KNOW 'ALL GAME' SCHEDULES/SPORTING EVENTS THAT TAKE PLACE IN NYC ON A 'DAILY' ROUTINE. BEING AN AVID SPORTS FAN ISN'T REQUIRED AS A PLT. THESE EVENTS ARE WELL KNOWN IN ADVANCE AND SHOULD BE GIVEN TO THE FAA TO BE INCORPORATED IN LCL FSS'S BRIEFINGS. IF MY FLT WERE TO LAND AT JRA VERSUS 6N5; I WOULD HAVE FLOWN S ON THE HUDSON -- NOT REQUIRED TO GET A CLRNC BY LGA (126.05) (IF I WAS BELOW 1100 FT.) AND WOULD HAVE PENETRATED A 'POP UP TFR' WITHOUT KNOWING ABOUT IT; (EVEN WITH A PROPER WX BRIEFING PRIOR TO DEP).