ACR FLT PROCEEDS ON TO DEST WITH LOW CREW OXYGEN AT 10000 FT AFTER HAVING RECEIVED A RE-RELEASE FOR DIVERSION TO ALTERNATE ARPT.

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FLT WAS AN MLG PLANNED BNA-SAN. CAPT CONTACTED ME 5 MINS W OF ABQ TO ADVISE HE WAS LOOSING COCKPIT OXYGEN. THIS ACFT WAS SVCED FOR THE PROB BY ACR BNA MAINT PRIOR TO DEP; BUT THE CORRECTIVE ACTION DID NOT CORRECT THE PROB. BECAUSE THE FLT WAS AT CRUISE ALT AND W OF ABQ AND THE ASSOCIATED MAINT AND ACFT RESOURCE CONSIDERATIONS (ACR MAINT AND ANOTHER ACFT TO UTILIZE IF THIS ONE WENT OTS) I AFTER CONTACT WITH TUL TECHNICAL; ASKED THE CAPT IF HE COULD MAKE PHX. HE SAID AFFIRMATIVE AND I THEN RERELEASED HIM TO PHX. APPROX 30 MINS LATER THE CAPT RECONTACTED ME THROUGH ARINC TO INQUIRE WHY COULD HE NOT CONTINUE TO SAN AT 10000 FT. I TOLD HIM I BELIEVED COCKPIT OXYGEN WAS REQUIRED FOR POTENTIAL SMOKE IN THE COCKPIT BUT WOULD CONFIRM WITH TUL TECHNICIAN. TECHNICIAN TOLD (RECONFIRMED) THAT WAS THE CASE AND I SENT AN ACARS MESSAGE TO THE CAPT STATING THE SAME AND THAT IF HE WISHED TO CONTINUE THE DECISION WAS HIS. THIS BRINGS UP THE PROB. IN ORDER TO COMPUTE BURN INFO; I HAD TO MANUALLY CONSTRUCT A LOW LEVEL RTE UTILIZING VICTOR AIRWAYS AMD INTERPOLATE WHAT HIS FUEL BURN WOULD BE FROM THE NEW COMPOSITE FLT PLAN (BOTH HIGH:LOW). I TOLD HIM THAT HIS ARR FUEL WOULD BE BTWN 5500-6000 LBS AND WHAT IT CONSISTED OF; 45 MINS RESERVE 30 MINS HOLD ALTERNATE NONE. SAN WAS 33 BROKEN VISIBILITY MORE THAN 6 MI. I HAD FORGOTTEN TO REVISE MY EARLIER RE-RELEASE TO PHX. FLT LANDED SAN AND ARRIVED AT GATE WITH 5700 LBS FUEL WITHOUT FURTHER INCIDENT. I AM FOLLOWING UP WITH COMPANY TO GET A PROC FOR LOSS OF COCKPIT OXYGEN. NEXT TIME I WILL SLOW DOWN; DOT THE I'S AND CROSS THE T'S.