AN UNDER AGE UNMONITORED 3 YR OLD MALE STOWS AWAY ON A PA31-350 COMMUTER AT SCM; AK; NOT BEING DETECTED UNTIL FLT LANDS AT BET; AK.

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AFTER LNDG IN SCAMMON BAY; I OFFLOADED PAX AND BAGGAGE STARTING AT THE BACK OF THE AIRPLANE. I LOADED 1 PAX BEFORE OFFLOADING THE WINGS AND NOSE BAGGAGE FROM THE REST OF THE AIRPLANE. I BELIEVE THIS IS WHEN THE YOUNG BOY (3 YRS OLD) SNEAKED ON BOARD THE PLANE. WHEN DONE OFFLOADING; I PROCEEDED TO THE REAR OF THE PLANE. I STEPPED UP ON THE STEPS AND LOOKED UP AND DOWN THE AISLE. I DID NOT NOTICE THE CHILD IN THE SEAT; AS HE WAS BELOW MY LINE OF SIGHT. ALSO; MY VIGILANCE WAS DOWN BECAUSE I HAD ALREADY LOADED MY ONE NON-REVENUE PAX AND I SAW ONLY WHO WAS SUPPOSED TO BE ON THE PLANE. (THIS CHILD HAS IN THE PAST TRIED TO SNEAK ON BOARD AIRPLANES; ACCORDING TO THE PARENTS.) ONCE INSIDE THE AIRPLANE; I TURNED AROUND SO AS TO NOTE THE POS OF MY PAX. I THEN DID MY WT AND BAL. I ONLY SAW 3 PAX (NOT 4)! AFTER I LANDED IN BETHEL; AK; A LITTLE BOY JUMPED OUT OF THE PORT SIDE SEAT; SECOND ROW FROM THE REAR -- HE WAS BEHIND PAX Y. THEN 2 NON-REVENUE PAX ON BOARD AND I WERE AMAZED AS THIS WAS THE FIRST TIME WE SAW THIS PERSON. PAX Y SAID THAT BEFORE WE DEPARTED SHE HAD LOOKED BEHIND HER AND SAW NO ONE IN THE SEAT. THIS LEADS ME TO BELIEVE THAT THE CHILD WAS HIDING -- PURPOSELY TRYING TO AVOID DETECTION. BEFORE WE DEPARTED SCAMMON BAY; AK; I GAVE THE DEP BRIEF EXPLAINING THAT SEATBELTS MUST BE WORN AND HOW TO OPERATE THEM. IN THE FUTURE; I WILL JUST NEED TO BE MORE VIGILANT AND WALK UP AND DOWN THE AISLE BEFORE DEP. HOWEVER; THIS IS DIFFICULT IN A NAVAJO WHEN FULL WITH LARGE PAX -- THERE IS LITTLE ROOM IN THE AISLE.