A BL8 AG PLT DEPARTED IN COMPLIANCE WITH THE LATEST INFO RECEIVED REGARDING THE LIFTING OF PART 91 FLT RESTRS. IT WAS LEARNED LATER THAT THE RESTRS HAD BEEN EXTENDED; RENDERING HIM IN VIOLATION OF THE RESTRS.

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I CONDUCTED NORMAL MOSQUITO CTL OP IN THE EARLY MORNING. AT ABOUT XB00; I LANDED TO RELOAD AND WAS INFORMED OF THE TERRORIST ACTION ON THE WTC; THAT ALL NATIONAL AIRSPACE WAS CLOSED. AT THAT TIME WE GNDED OUR ACFT. THE NEXT DAY I CALLED THE FSS AND WAS INFORMED THAT THE AIRSPACE WAS STILL CLOSED. I GNDED OUR ACFT FOR THAT DAY. I CALLED OUR LOCAL FSDO OFFICE REPEATEDLY TO FIND OUR THE STATUTE OF THE NATIONAL AIRSPACE. ON 9/THU/01 AT XB50 LOCAL TIME; I CALLED FSS AND WAS ADVISED THAT THE NATIONAL AIRSPACE WAS TO BE OPEN AT XA00 LOCAL TIME. AT XA30 LOCAL TIME I RESUMED MOSQUITO CTL OP THROUGHOUT THE COUNTY. AT ABOUT XL00 I LANDED AT THE MUNICIPAL ARPT DUE TO THE FACT THAT OUR FACILITY IS NOT LIGHTED. I WAS INFORMED BY A FRIEND AT THE ARPT THAT THE AIRSPACE HAD BEEN RE-CLOSED SINCE XA40 LOCAL TIME. SINCE WE OPERATE IN A SMALL RADIUS; WE DO NOT CHECK THE WEATHER; BUT ONCE IN THE MORNING. I PARKED THE ACFT AT THE ARPT AND IT WILL REMAIN THERE UNTIL THE AIRSPACE IS REOPENED. I UNDERSTAND THE REASONS AND I'M IN TOTAL AGREEMENT TO CLOSE THE AIRSPACE IN TIMES LIKE THIS. BUT I THINK IT WOULD BE HELPFUL IF THE LOCAL FSDO WOULD CALL THE LOCAL AERIAL APPLICATORS TO MAKE THEM AWARE OF SUDDEN CHANGES SINCE IT IS WELL KNOWN THAT MOST OF THEM OPERATE WITHOUT RADIOS. THE CONFUSION WAS VERY PRESENT AND COULD AND MIGHT HAVE CAUSED HARDSHIP.