FALCON 20 FLEW FROM MEXICO TO SAN THROUGH THE ADIZ WITHOUT FILING A FLT PLAN. HIS EXCUSE WAS THE MEXICAN FACILITY WAS CLOSED AND HE WAS UNABLE TO FILE UNTIL THE NEXT DAY.

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FLT MADE FROM TIJUANA; MEXICO (MMTJ) TO SDM; CA. FLT WAS VFR AFTER TWR CLOSED AT MMTJ TO SDM WHERE TWR WAS ALSO CLOSED. SAN APCH CTL WAS CONTACTED PRIOR TO LNDG AT SDM. A VFR FLT PLAN WAS NOT FILED; HOWEVER; UNITED STATES CUSTOMS WERE CONTACTED PRIOR TO DEP FROM MEXICO. ALSO; PER SAN FSS; THE ONLY REASON THE VFR FLT PLAN IS NEEDED IS TO ADVISE UNITED STATES CUSTOMS OF YOUR ARR. ALSO; PHONE CONTACT WAS ATTEMPTED FROM TIJUANA; MEXICO; TO SAN FSS. HOWEVER; CREW WAS UNABLE TO GET THROUGH TO FILE FLT PLAN. ALSO; MEXICAN OFFICIALS WERE CLOSED AT TIJUANA; MEXICO; SO THEY WERE UNABLE TO FILE A FLT PLAN. THE COMPANY CONTACTED UNITED STATES CUSTOMS OF OUR ARR TIME BECAUSE OF THE FLT PLANNING PROB. ALSO; CALLS TO SAN FSS SAID THEY WOULD NOT FILE A FLT PLAN FROM MEXICO TO UNITED STATES. THAT WOULD BE A FUNCTION OF MEXICO. SINCE THEY WERE CLOSED THIS WAS NOT POSSIBLE. ALSO; THE TOTAL FLT IS A DISTANCE LESS THAN 3 MI. OPENING A FLT PLAN WITH THIS DISTANCE WOULD BE UNSAFE. CONTACT WAS MADE WITH SAN APCH ADVISING OF OUR SIT AND LNDG ARPT. ALSO; UNITED STATES CUSTOMS HAD NO PROB WITH WHAT HAPPENED. SOLUTION: POSSIBLE ADVANCE FILING MADE THROUGH A UNITED STATES FSS.