Newsstand - Qantas tops in late flights

http://www.thesundaymail.news.com.au/common/story_page/0,5936,17077578%255E903,00.html

AN AVERAGE of 145 domestic airline flights are delayed every day in Australia, latest figures reveal.
Passengers were kept waiting as 4472 domestic flights were late leaving airports in August.
A further 260 flights were also cancelled in the month, according to statistics from the Australian Bureau of Transport and Regional Economics.
The data reveals the tardiest airline in August was Qantas.

Why is it that Qantas Intl flights out of Sydney are nearly always late. A check of the Sydney Airport website will reveal that some 80% of Intl flights were late over the past 2 months. Surely this is not a maintenance problem, more likely operational.