A B737-500 FLT ATTENDANT FORGOT THAT AN UNACCOMPANIED MINOR WAS ABOARD THE ACFT. THEY LEFT THE UNACCOMPANIED MINOR ABOARD AND DEPLANED THE ACFT.

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FLT FROM ZZZ TO PSP. AFTER DEPLANING ACFT; I ASKED FLT ATTENDANT #2 TO GET THE UNACCOMPANIED MINOR AND SHE SAID EVERYONE WAS GONE. I THOUGHT HE MIGHT HAVE LEFT WITH THE FAMILY HE WAS SITTING WITH SO I TOLD THE CREW I WAS GOING DOWN TO BAGGAGE CLAIM TO LOOK FOR HIM. AFTER SEARCHING THE BAGGAGE AREA AND NOT FINDING HIM; I SAW THE FAMILY HE WAS SITTING WITH AND ASKED THE LITTLE GIRL SITTING NEXT TO HIM IF THE UNACCOMPANIED MINOR HAD DEPLANED WITH HER FAMILY AND SHE SAID; 'NO; HE IS SLEEPING.' I RAN BACK TO SECURITY AND SAW THE GRANDPARENTS AND REALIZED THE BOY WAS STILL ON THE AIRPLANE. BECAUSE SECURITY WAS CLOSED; I HAD TO RUN AROUND THE ENTIRE PARAMETER OF THE ARPT TO GET BACK ON THE AIRPLANE. BY THE TIME I GOT THERE; A POLICE OFFICER WAS COMING DOWN THE JETWAY AND WE FOUND THE BOY UNDER A PILE OF BLANKETS; SLEEPING. THE ACFT WAS OPEN AND THE LIGHTS WERE STILL ON. ON BOARDING THE UNACCOMPANIED MINOR; I DID BRIEF HIM ON NOT TO LEAVE THE AIRPLANE WITHOUT THE FLT ATTENDANTS. SUPPLEMENTAL INFO FROM ACN 546983: I BEGAN HELPING ONE OF THE LAST PAX (A WOMAN WITH HER CHILD AND A CAR SEAT) TO CARRY HER BAGS TO THE ACFT DOOR AFTER CHKING THE LAVATORIES. AFTER HANDING THE WOMAN HER BAGS; I ASKED THE LOAD FLT ATTENDANT WHERE THE UNACCOMPANIED MINOR WAS. SHE THEN ASKED THE 'C' FLT ATTENDANT IF HE WAS STILL IN THE CABIN. SHE SAID NO. I HAD VISUALLY CHKED THE CABIN AND OVERHEAD BINS AS I CARRIED THE WOMAN'S BAGS UP AND HAD NOT SEEN ANYTHING UNUSUAL.