CABIN ATTENDANT RPT; B757; ORD-LGA; LOGGED; WING FLAP PROB; EXTENDED MANUALLY. EMER DECLARED. DIVERT TO JFK.

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THE CAPT DECLARED AN EMER DUE TO A FLAP PROB AND WOULD DIVERT TO JFK. HE STATED IT WAS AN ITEM (FLAPS) THAT HAD BEEN WRITTEN UP BEFORE AND IT WASN'T SERIOUS. THE FLAPS WOULD NEED TO BE LOWERED MANUALLY. THE CAPT STATED THAT THE LNDG WOULD BE NORMAL AND NO EVAC NECESSARY. AGAIN; HE ASSURED ME EVERYTHING WAS FINE. I INFORMED ALL THE OTHER FLT ATTENDANTS - WHO SEEMED CONCERNED ABOUT THE DIVERSION. WE PREPARED THE CABIN FOR A NORMAL LNDG AND THE CAPT MADE AN ANNOUNCEMENT TO THE PAX. HE EXPLAINED THAT THE FLAPS WOULD NEED TO BE LOWERED MANUALLY; AND WE WOULD NEED TO DIVERT TO JFK BECAUSE THE RWYS WERE LONGER. THERE WAS NO NEED TO BE CONCERNED. THE PAX WERE CALM AFTER THE ANNOUNCEMENT. EVERYONE WAS FINE. WE LANDED IN JFK AND TAXIED TO THE GATE WITHOUT INCIDENT. EVERYONE DEPLANED THROUGH THE FORWARD BOARDING DOOR AS NORMAL; AND WERE MET BY PAX SVC. MAYBE THIS SIT COULD HAVE BEEN AVOIDED BEFORE DEP. IF THEY KNEW THIS AIRPLANE'S FLAPS HAD BEEN WRITTEN UP; WHY DID THEY SCHEDULE IT TO FLY INTO LGA WHERE THE FLAPS ARE NEEDED SO MUCH?