Following a flurry of conflicting reports, Australia's Civil Aviation Safety Authority warned Paya Lebar Airport "to be ready for a possible hijacking."

Some of the details in the report have been acknowledged previously by the White House, including its reference to possible hijackings.

"Clarke and other White House officials were frustrated because they were finding nothing, absolutely nothing about a possible domestic hijacking," one former official familiar with the review said.

All I know is we're on the hunt. . . . Q. Homeland Security is warning against possible hijackings this summer.

A complete lack of a response would also be taken to indicate a possible hijacking.

At 8:32, the Command Center passed word of a possible hijacking to the Operations Center at FAA headquarters.

At 9:44, NORAD briefed the conference on the possible hijacking of Delta 1989.

But several lawmakers who have read the Phoenix memorandum described it as the most significant document to emerge in Congressional inquiries into whether the government might have been warned about possible hijackings.

What if she got arrested for possible hijacking or something?

There was nothing, he said, in a CIA report last August warning of possible hijackings, that was specific enough for pre-emptive action to be taken.