FO OF ACR MLG ACFT FAILED TO OBTAIN THE PRE-DEP CLRNC FLT PLAN PRIOR TO TKOF AND OPERATED THE ENTIRE FLT RTE WITHOUT AN IFR CLRNC.

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DUE TO EARLY MORNING DEP; HUMAN FACTORS WERE NOT AT 100 PERCENT. EVEN THOUGH SEVERAL PERSONAL TECHNIQUES WERE USED TO REMIND ME TO GET ENRTE CLRNC; THIS WAS STILL NOT ACCOMPLISHED. WE DEPARTED THE GATE; TAXIED TO THE RWY; AND DEPARTED. IT WASN'T UNTIL JUST AFTER LIFTOFF WE DISCOVERED WE HAD NOT OBTAINED OUR ENRTE CLRNC. NEITHER GND CTL; TWR; OR DEP CTL QUESTIONED US. AFTER LNDG IN EWR; WE DID CONTACT PIT TWR TO CONFIRM NO PROBS WERE CAUSED. CALLBACK CONVERSATION WITH PIT TWR PROC SPECIALIST REVEALED THE FOLLOWING INFO: DISCUSSION WITH A PIT TWR PROC SPECIALIST DISCLOSED THAT SINCE THE FLC DID NOT CONTACT CLRNC DELIVERY WHEN USING THE PRE-DEP CLRNC FLT PLAN METHOD; THERE IS NO ROUTINE METHOD OF CHKING; OR VERIFYING THAT THE FLT HAS RECEIVED THEIR FLT PLAN AS GND CTL IS NOT DESIGNED TO VERIFY THE FLT PLAN RECEIPT. THE FAA SPECIALIST FURTHER STATED THAT FLT PLAN STRIPS ARE PRODUCED WHEN THE FAA ATC FACILITY RECEIVES BACK THE CARRIER ACKNOWLEDGEMENT OF THE FLT PLAN FROM ATC WHICH INCLUDES THE XPONDER SQUAWK ALONG WITH ANY OTHER LCL DEP INFO. HE ALSO STATED THAT FIRST TIME ATC WILL HAVE AN INDICATION THAT THE ACFT IS NOT FOLLOWING THE DESIGNED FLT PLAN IS UPON LIFTOFF SHOWING THE WRONG XPONDER CODE AND SUBSEQUENT HDGS AND ALTS IN ERROR. HE BELIEVES THAT THE PRE-DEP CLRNC PROC WAS ESTABLISHED TO REDUCE THE RADIO FREQ CONGESTION AND THAT THE CARRIER NEEDS TO PUT IN PLACE METHODS TO ASSURE THAT THIS INCIDENT DOES NOT HAPPEN.