You all can read about the issue here
http://sg.news.yahoo.com/060221/1/3yu1p.html
I believeit has little to do with the drug case, but more to do
with competition with their national carrier, Qantas.
But he said the government viewed the trans-Pacific route as a "key
national asset" and would only negotiate access to the route "when
it is in the national interest.
"In terms of the Singapore Airlines' request for access (to
Australia-US routes), the government has decided not to grant them
access at the present time," he said.
"If access is negotiated in the future, it will be limited and it
will be phased."
Qantas, which earns as much as 20 percent of its profits from its
Sydney-Los Angeles services, had argued that it would be
disadvantaged if state-backed airlines such as Singapore Airlines
were allowed to fly the route