As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6334 - ATL-LEX - SMOKE IN CABIN DURING TAKEOFF CLIMB JUST AFTER ROTATION. FLIGHT ATTENDANT OBSERVED SMOKE IN CABIN AND CREW NOTED WHAT THEY THOUGHT TO BE ELECTRICAL SMELL. DECLARED AND EMERGENCY AND RETURNED TO FIELD. NO SIGNS OF SMOKE PRESENT AT GATE, BUT MAINTENANCE DID NOTE THEY SMELLED A HINT OF OIL SMELL UPON ARRIVAL TO AIRCRAFT. MAINTENANCE RAN BOTH ENGINES AT ALL POWER SETTINGS WITH CREW FOR 45 MINUTES, COULD NOT DUPLICATE. OPS CHECK GOOD.