A B737-300 PLT PERCEIVED THE WINGS FREE OF ICE BEFORE TKOF AND THEREFORE DID NOT DE-ICE. DEADHEADING PLTS RPT SIGNIFICANT WING ICE AT TKOF.

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CONDUCTED NORMAL PREFLIGHT. I INCLUDED A BRIEF EXTERIOR INSPECTION UPON ARR AT GATE AS FO ARRIVED JUST AFTER DUE TO LATE ARRIVING DEADHEAD FLT. PUSHED LATE AFTER FAIRLY EXPEDITIOUS BOARDING. NOTHING SIGNIFICANT ON TAXI OUT. FO AND I CONFERRED ABOUT NEED TO DE-ICE OR NOT. BOTH CONCLUDED THE NEED DID NOT EXIST BASED ON VISUAL INSPECTIONS; RPTED TEMPERATURE; AND THE FACT THAT THERE WAS NO OBSERVABLE ACCUMULATION OF PRECIPITATION. DEPARTED APPROX 15 MINUTES AFTER PUSHBACK ON RWY 27L; AND FLT WAS COMPLETELY UNEVENTFUL.SUPPLEMENTAL INFO FROM ACN 764642: AFTER ARRIVING AT THE ACFT I CONDUCTED THE PREFLT EXTERIOR INSPECTION. THERE WAS A LIGHT DUSTING OF SNOW ON THE TOP OF THE FUSELAGE; NOSE; AND ENGINE COWLING. I COULD NOT GET A GOOD LOOK AT THE TOP OF THE WINGS FROM THE GND. I DON'T KNOW IF THE CAPT CHKED THE WINGS FROM THE EMER EXIT WINDOWS (HE MIGHT HAVE). THERE WAS SOME CONVERSATION BETWEEN THE CAPT AND FLT ATTENDANT ABOUT DEICING BUT I DON'T REMEMBER WHEN. I WAS BUSY AND REALLY DON'T KNOW WHAT IT WAS ABOUT. WE TAXIED OUT AND NOTICED SOME ACFT WERE DEICING AND SOME WEREN'T. WITH THE NEW ATIS; THE TEMPERATURE HAD RISEN TO ABOVE FREEZING; THE WINDOWS AND NOSE WERE CLEAN. WE BOTH LOOKED OUTSIDE AT THE WINGS AND THEY LOOKED CLEAN. WE AGREED THE ACFT DID NOT REQUIRE DEICING. WE TOOK OFF WITHOUT INCIDENT. I SHOULD HAVE CHKED THE TOP OF THE WING FROM THE OVER WING EXITS. I SHOULD HAVE ASKED THE CAPT IF HE CHKED THE WINGS. IF ANY OTHER EMPLOYEE HAD CONCERNS; THEY SHOULD HAVE BROUGHT IT TO THE CAPT'S ATTENTION PRIOR TO TAKEOFF.SUPPLEMENTAL INFO FROM ACN 764639: I WAS A DEADHEADING CREWMEMBER ON FLT FROM ZZZ. GOT ONBOARD WITHOUT SEEING THE CAPT AND PROCEEDED TO REAR OF ACFT. SAT NEXT TO WINDOW (WITH OTHER DEADHEADING PLT IN ROW BEHIND ME NEXT TO WINDOW ALSO). NOTICED THERE WAS LIGHT SNOW FALLING; WITH SOME ACCUMULATION ON WINDOWS AS WELL AS THE WINGS. THE OTHER PLT AND I TALKED ABOUT THE DE-ICE LOCATION IN ZZZ AS I HAD NOT DE-ICED THERE BEFORE. TAXIED OUT RATHER BRISKLY; WITH BOTH OF US ASSUMING WE'RE GOING TO THE DE-ICE PAD. AFTER A BIT OF TAXIING; WE HEAR THE FLT ATTENDANT 'CHIME' FOR TAKEOFF AND THE POWER INCREASING FOR TAKEOFF. I TURNED AROUND IN MY SEAT AND SAID TO THE OTHER PLT; 'WE'RE TAKING OFF?' AT LIFTOFF; THE SNOW/SLUSH ON THE FRONT HALF OF WING SLID OFF. CLBOUT BROUGHT MAYBE 2/3 OF SNOW/SLUSH OFF OF THE BACK HALF OF THE WING. THE LAST 1/3 OF REMAINING SNOW SLOWLY DISSIPATED IN CRUISE. AFTER LNDG; WE SPOKE TO CAPT IN THE JETWAY ABOUT DEICING IN ZZZ AND THE AMOUNT OF SNOW ON THE WINGS. HE STATED THAT IT WAS ABOVE FREEZING AND THAT WE DIDN'T NEED TO DE-ICE. I TOLD HIM I'D NEVER SEEN THAT MUCH SNOW ON THE WINGS AND THAT I DIDN'T KNOW THE AIRPLANE WOULD EVEN FLY LIKE THAT. WE TOLD HIM THAT THE PAX AND FLIGHT ATTENDANTS WERE VERY CONCERNED AND WE WALKED OFF TRYING TO MAKE SENSE OF WHAT JUST HAPPENED. LATER ON IN THE TERMINAL WHILE WE WERE WAITING FOR OUR INBOUND FLT; CAPT APCHED ME AND ASKED EXACTLY WHAT I'D SEEN ON THE WINGS. I TOLD HIM IT WAS A LOT OF SNOW AND THAT WE THOUGHT CERTAINLY HE WAS GOING TO DE-ICE; AND THEN BEFORE WE KNEW IT; WE WERE TAKING OFF. HE REITERATED THAT IT WAS ABOVE FREEZING AND THAT HE DIDN'T THINK HE NEEDED TO DE-ICE.SUPPLEMENTAL INFO FROM ACN 764644: I WAS A DEADHEADING CREWMEMBER ON FLT FROM ZZZ. I BOARDED THE ACFT AND SAT ON THE FO'S SIDE TWO ROWS FROM THE REAR. IT APPEARED TO ME THAT IT WAS SNOWING AT THE TIME OF BOARDING AS THE WING WAS PARTIALLY COVERED WITH APPROX 1/4 INCH OF SNOW MIXED WITH WHAT APPEARED TO BE SLUSH. I MIGHT POINT ALSO THAT THE WINDOW I WAS LOOKING OUT OF WAS PARTIALLY OBSCURED WITH SNOW AND ICE.