ATX X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ATX Y. SYS ERROR.

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ATX Y SCHEDULED NIGHTLY CARGO FLT BTWN MONTEREY; MEXICO; AND HARLINGEN; TX; ON VICTOR 10. ALMOST NIGHTLY; ATX X PASSES ME. THEIR DEP IS 10 MINS AFTER ME FROM MONTEREY AND THEY PROCEED ON VICTOR 10 TO MCALLEN; TX. THEY'RE IN AN LTT AND SO ARE ABOUT 50 KTS FASTER THAN MY SMT. THEY ARE USUALLY PASSING ME AT 11000 BUT WANT TO DSND FOR MCALLEN. ON THIS EVENING THEY WERE BEHIND ME WHEN I WAS SWITCHED FROM MTY CTR TO VALLEY (CORPUS CHRISTI) APCH. I LISTENED TO HARLINGEN ATIS AND COMMUNICATED WITH MY COMPANY PRIOR TO ESTABLISHING CONTACT WITH VALLEY. ON MY FIRST CONTACT I HEARD THE CTLR CLR ATX X FROM 11000 TO 3000. I CALLED AND THE CTLR SAID I WAS NOT RADAR CONTACT YET. I HEARD HER TELL ATX X HE WAS NOT RADAR CONTACT YET EITHER. I LOOKED OUT MY L SIDE JUST IN TIME TO SEE ATX X IMMEDIATELY ABOVE MY L WING. I TALKED TO APCH ON THE PHONE AND THEY SAID SOME 'THINGS HAD FALLEN INTO A CREASE DURING THE HDOF FROM MONTEREY CTR.' FROM NOW ON I WILL SWITCH AND COMMUNICATE IMMEDIATELY ON HDOFS. ALSO; I WILL KEEP VERY CLOSE TRACK OF ATX X.