CABIN ATTENDANT RPT; F100; SAT-ORD. DIVERTED TO ST LOUIS TO HAVE BURNING RUBBER SMELL CHKED OUT BY FIRE DEPT.

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2 FLT ATTENDANTS IN COACH SMELLED BURNING RUBBER/ELECTRICAL ODOR. I CALLED COCKPIT. THE FO CAME BACK TO SMELL AND DID NOT NOTICE ANYTHING. THE SMELL DISSIPATED. 20 MINS LATER; THE SMELL RECURRED IN SAME AREA. I CALLED THE COCKPIT AGAIN. THE FO CAME BACK AGAIN AND DID NOT SMELL ANYTHING. THE SMELL DISSIPATED. ABOUT 20 MINS LATER; I SMELLED IT AGAIN NEAR ROW 11; NEAR THE FRONT OF THE CABIN. I CALLED #1 FLT ATTENDANT TO SEE IF SHE SMELLED IT. SHE SAID YES. I WENT INTO THE COCKPIT AND TOLD THE CAPT IT WAS A BURNING SMELL; NOT NORMAL AT ALL. AS I HAVE BEEN FLYING F100'S FOR 8 YRS; I STRESSED TO HIM I HADN'T SMELLED THIS ON THIS ACFT BEFORE. IT WAS ABNORMAL; AND THERE WAS STILL AT LEAST 1 HR LEFT IN THE FLT. I WOULD RATHER LAND AND DIVERT. THE COCKPIT HAD DISCUSSED THIS WITH ME AFTER I CALLED ABOUT THE SMELL THE SECOND TIME. THE CAPT MADE AN ANNOUNCEMENT TO THE PAX AND WE LANDED IN ST LOUIS WITHOUT INCIDENT. THE FIRE DEPT CAME ON TO CHK ACFT. ALL FLT ATTENDANTS HAD MINOR HEADACHES THAT EVENING THAT WE ASSOCIATED TO THE ABNORMAL SMELL. (WE HAD CHKED LAVATORIES AND SOME OVERHEADS AFTER THE SMELLS THE FIRST TIME; TO RULE OUT OTHER FACTORS.) CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THEY DID NOT PREPARE THE PLANE FOR AN EVAC; AND THAT THE CAPT SAID THAT IT WAS VERY UNLIKELY THEY WOULD; BUT HE'D USE THE STANDARD 'EASY VICTOR' IF THEY DID. THE PLANE WAS TAKEN OTS IN ST LOUIS; AND THE CREW CHANGED PLANES. SHE SAID THE CAPT TOLD HER THAT HE WOULD LEAVE A NOTE IN HER MAILBOX; WHEN HE FOUND OUT WHAT THE SOURCE OF THE SMELL WAS BUT SO FAR HE HADN'T.