SAO PAULO (Reuters) - An Avianca Holdings SA flight connecting the Brazilian cities of São Paulo and Juazeiro do Norte had to make a precautionary, emergency landing in Brasilia on Tuesday, after the aircraft presented ventilation system problems.

In a statement, Avianca's <AVT_p.CN> Avianca Brasil unit said the 6378 flight with the crew and 99 passengers landed safely.

(Reporting by Guillermo Parra-Bernal; Editing by Lisa Shumaker)