Looks like somebody took the warning seriously:

The White House is in full panic mode trying to find a way to spin the now-admitted fact that George Tenet did indeed brief Condi Rice on July 10, 2001 about the terror threat. The latest damage control approach has been to claim that the report was "nothing new".

So how come when then-Attorney General John Ashcroft heard the same warning a week later, he immediately stopped flying commercial aircraft?

Yea, a few people would like to know why the Attorney General took steps to protect himself, but nothing to protect the public.