S80 RECEIVES AIRBORNE CORRECTION TO WTS OF 4000 LBS AFTER DEP FROM JAX.

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I HAVE BEEN GOING IN AND OUT OF JAX FOR A MONTH AND TO SAY THE LEAST; I AM NOT IMPRESSED WITH THEIR OP. FOUR WKS AGO; BROUGHT IN AN ACFT WITH 2 MAINT WRITE-UPS. BOTH WERE CALLED IN VIA RADIO AND ALSO TOLD AGENT UPON LEAVING ACFT. CAME OUT NEXT MORNING; SAME ACFT; ABSOLUTELY NOTHING HAD BEEN DONE ABOUT THE WRITE-UPS. TWO WKS AGO; FLT JAX-DFW. UPON ARR AT DFW; I FOUND OUT WE HAD PORTABLE OXYGEN IN THE CABIN FOR A PAX. NEVER RECEIVED A NOTICE AS REQUIRED. I DID SPEAK TO THE STATION MGR ABOUT THE ABOVE 2 ITEMS. NOW; AFTER TKOF; WE RECEIVE A NEW CLOSEOUT WITH A DIFFERENCE OF ALMOST 4000 LBS AND A PAX DIFFERENCE OF +21. INITIALLY CLOSED OUT ABOUT 8000 LBS LIGHTER THAN PLANNED; SO WE PULLED UP NEW NUMBERS FOR THE NEW WT; REDUCING OUR SPDS ABOUT 5 KTS. AFTER TKOF WITH THE NEW WT; IT WOULD HAVE REQUIRED AN EXTRA 3 KTS TO ALL OUR SPDS. FOR EXAMPLE; WE ROTATED 3 KTS TOO SLOW. HEAD COUNT BY FLT ATTENDANTS CONFIRMED PAX COUNT OF 117 PAX AND 6 LAP BABIES. THERE WERE MANY SAFETY ISSUES INVOLVED HERE. I DO NOT UNDERSTAND HOW THE PAX COUNT COULD BE OFF BY THAT MANY PEOPLE; BUT I FEEL THERE IS NO EXCUSE FOR THAT LARGE OF AN ERROR.