As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3225 DISC: ON DESCENT INTO SAT, "DIRTY SOCK SMELL" IN COCKPIT. BOTH PILOTS WENT ON O2 FOR REMAINDER OF FLIGHT; AT GATE SMELL WAS NO LONGER PRESENT. AN EMERGENCY WAS DECLARED WITH ATC. C/A: REF LOG 0992664 FOR WORK PERFORMED. A/C OK FOR SVC. (LP: 7383286)