ZMA CTLR QUESTIONS MUCH ABOUT A FLT PLAN PROPOSAL; REALIZING THAT THE WRONG FOREIGN ACR MAY HAVE BEEN POSTED FOR JURISDICTION XFER. ZMA CTLR ALLEGES INCORRECT FLT PLAN PROPOSAL XFERS ARE A RECURRENT PROB WITH FOREIGN ATC FACILITIES.

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ALL FLTS INTO THE NAS FROM NON INTEGRATED FOREIGN COUNTRIES MUST BE MANUALLY COORDINATED. NORMALLY; A 'PROPOSED FLT' IS ENTERED INTO THE NAS; AND PRINTS AT THE APPROPRIATE SECTOR. AS EARLY AS POSSIBLE; THE FOREIGN FACILITY MANUALLY PASSES THE NECESSARY INFO VIA LANDLINE COMS AT THE SECTOR. FOR PROPOSAL FLTS IN THE SYS; THIS INCLUDES ONLY COORD FIX TIME; ALT; AND BEACON CODE. IT IS ONLY NECESSARY TO PASS ALL FLT PLAN INFO IF NO PROPOSAL FLT HAS BEEN ENTERED INTO THE SYS. HAVANA CTA/FIR CTLR CALLED WITH AN ESTIMATE FOR XXXABC. I HAD A PROPOSAL FLT AT THE SECTOR MATCHING THAT CALL SIGN; SO I COPIED ONLY THE FIX TIME; ALT; AND BEACON CODE. 15 MINS LATER; HAVANA CTLR CALLED BACK TO SAY 'REF; XXXABD THE CORRECT CALL SIGN IS XYZABD EVERYTHING ELSE IS THE SAME.' FLT NUMBERS SOMETIMES GET TYPED INTO THE NAS WRONG; USUALLY OFF BY 1 DIGIT. XXX AND XYZ ARE 2 DIFFERENT SCHEDULED ACR OPERATORS FROM 2 DIFFERENT COUNTRIES. I AM UNAWARE OF ANY RTE SHARING AGREEMENT BTWN THEM. HAVANA CTLRS SOMETIMES PASS THE WRONG FLT PLAN ESTIMATE. I HAD NO PROPOSAL FLT PLAN FOR XYZABD. I SAID; 'CONFIRM XXXABC; SCEL TO KMIA; IS NOW XYZABD?' THE HAVANA CTLR SAID 'NO; XYZABD DEPARTED SEGU AND IS LNDG KJFK.' I TOLD THE HAVANA CTLR TO RETRIEVE ALL NECESSARY INFO AND PASS ME A FULL FLT PLAN ESTIMATE; WHICH I THEN ENTERED INTO THE SYS AT THE SECTOR. HAD I NOT BEEN NATURALLY SUSPICIOUS; THIS ERROR WOULD NOT HAVE BEEN CAUGHT UNTIL THE ACFT ENTERED UNITED STATES AIRSPACE AND WAS GIVEN A CLRNC TOWARDS A MIA ARR GATE A MERE 57 MI AWAY. THE SECTOR WAS BUSY AT THE TIME; AND SUCH AN ERROR WOULD HAVE INCREASED THE CTLR WORKLOAD SIGNIFICANTLY. IF THE ACFT WENT NORDO AND DEVIATED FROM THE FPR WE EXPECTED; IT WOULD HAVE UNDOUBTEDLY BEEN SCRAMBLED ON. A VISUAL INSPECTION BY AN INTERCEPTOR ACFT OBSERVING THE WRONG PAINT SCHEME ON AN ACR ACFT IS A POTENTIAL DISASTER. WE WORK WITH MANY FOREIGN COUNTRY ATC PROVIDERS AT ZMA. THEY ALL NEED TO DO A BETTER JOB OF PASSING ACCURATE INFO IN A TIMELY MANNER (SEE ANOTHER ASRS RPT FILED BY SAME RPTR ON SAME DATE). SUCH ERRORS ARE COMMONPLACE.