B757 FO RPTS CONFUSION OVER REVISED SEGMENT OF PDC AND ASSUMES MAXXO 1 CNX MEANS THE MAXXO 1 IS CANCELLED FLY THE SJN 3. TRACK DEV.

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ON THIS FLT; WE HAD COME IN FROM OUR PREVIOUS FLT LATE; AND HAD A GATE CHANGE. THIS GAVE US ABOUT 45 MINUTES BETWEEN FLTS. DURING OUR PREFLT DUTIES; I LOADED OUR FLT PLAN FROM OUR RELEASE INTO THE FMS. WE WERE PLANNED FOR THE SAINT JOHNS 3 DEP (SJN3.SJN). WHEN I RECEIVED THE PDC VIA THE ACARS; THERE WAS AN AMENDMENT ON IT WHICH READ: MAXXO1 CNX. UNDERNEATH; IT SAID 'FILED FLT PLAN SJN3.SJN....ETC.' I THOUGHT TO MYSELF: 'WHY DO I CARE IF THE MAXXO1 DEP IS CANCELLED; I'M FILED ON THE SJN DEP?' BEING IN A HIGH WORKLOAD AREA (WE WERE LATE; AND STRUGGLING TO GET CAUGHT UP); I INTERPRETED THIS AS 'MAXXO1 CANCELLED' BUT IT ACTUALLY MEANT WE WERE BEING ASSIGNED TO THE MAXXO 1 DEP WITH THE CORONA TRANSITION; CNX IS THE THREE LETTER IDENTIFIER FOR A VOR ON THE DEP PROC. IN MY HURRY TO CATCH UP; I'D MISTAKEN A CHANGE IN OUR ROUTING TO BE A CLOSURE OF A DEP OR SOME OTHER THING WHICH I DIDN'T THINK MUCH ABOUT BECAUSE I BELIEVED I WAS DOING THE SJN DEP. IF I HAD STOPPED TO THINK ABOUT IT; I WOULD PROBABLY HAVE MADE THE CONNECTION; BUT; AS I SAID EARLIER; I WAS TRYING TO MAKE UP SOME TIME. THE RESULT IS THAT WE DEPARTED WITH THE SJN 3 IN THE FMC; AND NOT THE MAXXO 1. AFTER TAKEOFF; WE FLEW THE DEP; AND AT PHX 9.5 DME; MADE A TURN TO THE NORTH; NOT A TURN TO THE SOUTH. ATC WAS QUICK TO NOTICE; AND WITH SOME VECTORS AND COORD WITH CENTER; PUT US ON THE SJN DEP. ATC KINDLY POINTED OUT TO US THAT WE WERE FLYING THE WRONG DEP. ONCE THE ERROR WAS DISCOVERED; WE WERE GIVEN VECTORS WHILE ATC COORDINATED WITH ARTCC TO PUT US ON THE DEP WE WERE ORIGINALLY FILED ON; THE SJN 3. ONCE WE WERE ON WITH ABQ CENTER; WE WERE GIVEN A PHONE NUMBER TO CALL; WHICH WE DID UPON ARR. THE PHX DEP PERSON SAID THEY WOULD BE FORWARDING A RPT UP THE LADDER. I BELIEVE THAT THIS WOULD HAVE BEEN AVOIDED WITH ANY OTHER DEP OR VOR IDENTIFIER. CNX IS THE COMMON ABBREVIATION FOR 'CANCELLED' AND WHEN YOU SEE A MESSAGE ON THE ACARS WITH 'CNX' AT THE END OF IT; THAT IS WHAT YOU TEND TO READ. IF YOU ARE AT A TIME OF HIGH WORKLOAD; OR UNFAMILIAR; IT CAN REALLY BITE YOU. THE THREE LETTER IDENTIFIER FOR CORONA VOR SHOULD BE CHANGED. ALSO; WE WERE EXPERIENCING A TIME OF HIGH WORKLOAD; HAVING HAD AN ACFT SWAP; AND A REDUCED TURN TIME DUE TO BEING LATE ARRIVING ON OUR PREVIOUS FLT. IN ADDITION; I AM A RESERVE WHO HAD A TWO HOUR CALL OUT AT XA25; AND WHEN I ARRIVED; FOUND THAT MY FIRST TURN WAS A ZZZ TURN WITH A LINE CHECK. ALL THESE FACTORS HAD ME A LITTLE 'OFF BALANCE;' AND I DIDN'T NOTICE A FEW THINGS I SHOULD HAVE. IN THE FUTURE; I SHOULD NOT LET MY CONCERN WITH GETTING THE FLT OUT ON TIME INTERFERE WITH GETTING MY JOB DONE CORRECTLY. ALSO; THE THREE LETTER IDENTIFIER FOR THE CNX VOR OUGHT TO BE CHANGED.