As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1446 - AFTER TAKEOFF DFW DURING CLIMB-OUT, ODOR NOTED IN CABIN WITH NO EVIDENCE OF SMOKE. AIRCRAFT RETURNED TO DFW AND LANDED OVERWEIGHT WITHOUT INCIDENT. ACCOMPLISHED GROUND ENGINE RUN AND OPERATED BOTH AIR CYCLE MACHINES WITH NO DEFECTS FOUND. UNABLE TO DUPLICATE ODOR. ACCOMPLISHED OVERWEIGHT LANDING INSPECTION WITH NO DEFECTS FOUND. SYSTEMS GROUND CHECKED NORMAL OPERATION AND AIRCRAFT RETURNED TO SERVICE. (X)