A LATAM Brasil Airbus A321-200, registration PT-XPO performing flight JJ-3366 from Sao Paulo Guarulhos,SP to Joao Pessoa,PB (Brazil), was enroute at FL310 about 220nm northeast of Sao Paulo when the crew decided to return to Sao Paulo reporting a burning odour and white smoke in the cockpit and cabin. The crew worked the related checklists, after working the checklists and turning off pack #1 the smoke dissipated. The aircraft landed safely back at Guarulhos Airport about 75 minutes after departure.
A replacement A320-200 registration PR-MHW reached Joao Pessoa with a delay of 3.5 hours.
The occurrence aircraft is still on the ground in Sao Paulo about 25 hours after landing back.