<diacritize> On Tuesday evening , July 17 , 2007 , about seven oclock , a passenger plane skidded off the runway at Brazils busiest airport , in the heart of Sao Paulo . <yor>On Tuesday evening , July 17 , 2007 , about seven oclock , a passenger plane skidded off the runway at Brazils busiest airport , in the heart of São Paulo . 