A B757 FLT IS BOARDED BY THE CSR WITH ONLY 1 CABIN ATTENDANT ON BOARD.

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UPON ARR AT THE GATE; CHK IN WITH THE CSR WAS ROUTINE. 1 FLT ATTENDANT WAS ON BOARD WITH THE OTHER 3 MAKING A CONNECTION AT DEN. WHILE WAITING FOR THE OTHER 3 FLT ATTENDANTS TO ARRIVE; THE FO AND I COMPLETED MUCH OF THE COCKPIT SETUP. I THOUGHT I WOULD INTERRUPT THE SETUP AND CHK THE STATUS OF THE FLT ATTENDANTS BY WALKING BACK OUT TO THE CSR COUNTER. TO MY SURPRISE; THERE WERE ABOUT 10 PAX ON BOARD THE ACFT -- IT APPEARED THAT THE FLT ATTENDANT STOPPED THE LOADING. I INQUIRED AS TO WHAT HAPPENED WITH THE CSR AND SHE SAID THAT THE NEW PROC WAS THAT SHE COULD LOAD PAX UNLESS THE FLT ATTENDANTS CALLED THE CSR DESK TO DELAY LOADING. I INDICATED THAT ONLY 1 OF THE 4 FLT ATTENDANTS HAD CHKED IN AT THE DESK FOR SECURITY. AT THIS POINT; I ASKED THE PAX TO GO BACK TO THE BOARDING AREA AND WAIT UNTIL THE REMAINING FLT ATTENDANTS ARRIVED. THEY UNDERSTOOD WHEN I EXPLAINED IT WAS FOR THEIR SAFETY AS WE WERE IN THE PROCESS OF REFUELING. THE PAX WERE ON BOARD FOR 2-4 MINS (I THINK) WITHOUT THE APPROPRIATE NUMBER OF FLT ATTENDANTS. I CHATTED WITH THE ONBOARD SUPVR WHO EXPLAINED THAT THE 3 FLT ATTENDANTS HAD TO HANDLE A SICK PAX ON THEIR INBOUND FLT AND WERE DELAYED ARRIVING TO FLT ABC. I ALSO EXPLAINED THAT THIS EVENT VIOLATED THE FARS.