Narrative:

After walkaround, found performance management system, ZFW programmed, and fuel programmed into ACARS. Assumed captain had also got pre departure clearance. Before takeoff check, neither of us tried to compare squawk to pre departure clearance paper. Transponder still had code from previous flight. After takeoff departure said squawk 1323. Thought it was a change, not unusual. Later saw destination flashing on ACARS. Checked and found previous flight number still loaded. I was appalled to realize we didn't have pre departure clearance. Had even told metering we did. I have written/confirm transponder on my before start check and hi-lighted it in red. Will train myself to load 1200, a number not used for IFR, into transponder after landing after landing to protect others. New procedures at ord don't require readback of transponder code. I recommend they do.

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Original NASA ASRS Text

Title: DEPARTED WITHOUT PDC (PREDEP CLRNC) OR IFR CLRNC. NEITHER FLC CHKED RECEIPT OF PDC AND OR XPONDER CODE. AFTER TKOF ATC ISSUED SQUAWK AND ROUTING CLRNC.

Narrative: AFTER WALKAROUND, FOUND PERFORMANCE MGMNT SYS, ZFW PROGRAMMED, AND FUEL PROGRAMMED INTO ACARS. ASSUMED CAPT HAD ALSO GOT PDC. BEFORE TKOF CHK, NEITHER OF US TRIED TO COMPARE SQUAWK TO PDC PAPER. XPONDER STILL HAD CODE FROM PREVIOUS FLT. AFTER TKOF DEP SAID SQUAWK 1323. THOUGHT IT WAS A CHANGE, NOT UNUSUAL. LATER SAW DEST FLASHING ON ACARS. CHKED AND FOUND PREVIOUS FLT NUMBER STILL LOADED. I WAS APPALLED TO REALIZE WE DIDN'T HAVE PDC. HAD EVEN TOLD METERING WE DID. I HAVE WRITTEN/CONFIRM XPONDER ON MY BEFORE START CHK AND HI-LIGHTED IT IN RED. WILL TRAIN MYSELF TO LOAD 1200, A NUMBER NOT USED FOR IFR, INTO XPONDER AFTER LNDG AFTER LNDG TO PROTECT OTHERS. NEW PROCS AT ORD DON'T REQUIRE READBACK OF XPONDER CODE. I RECOMMEND THEY DO.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.