As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT 2 HOURS INTO FLIGHT FA'S REPORT BURNING SMELL SIMILAR TO OR BURNT HAIR THE SMELL WAS MOST NOTICED FROM ROW 19-24 AND IN FRONT & BACK GALLEY SMELL WAS INTERMITTENT STRONG FOR A FEW MIN MINUTES THEN GONE COMPLETELY CAME AND WENT SEVERAL TIMES. COMPLIED WITH CONDITIONAL INSPECTION PER AMM 05-51-56. REF TTG8Q00U3XX4 FOR RECIRCULATING FAN R&R