Declassified CIA Brief Warned of Hijacking Plans

A newly declassified 1998 Central Intelligence Agency brief warned that Osama bin Laden was preparing to hijack U.S. aircraft—and the government still failed to stop what followed.

Story Snapshot

A December 4, 1998 President’s Daily Brief warned of bin Laden hijack plans.
The 9/11 Commission confirmed the brief’s existence and declassification.
Top officials later said the warnings lacked time, place, and method details.
Airline security and agency steps did not slow the plot before 9/11.

What the Newly Highlighted Document Says

On December 4, 1998, the Central Intelligence Agency warned the White House that bin Laden was preparing to hijack U.S. aircraft and conduct other attacks. The text, delivered as part of the President’s Daily Brief, stated that some members of his network had received hijack training. The item was later declassified for the 9/11 Commission’s review, and it sits today as a stark early marker of a risk that many Americans assumed no one saw coming.

Reports at the time described scenarios that echo the danger that arrived less than three years later. The Central Intelligence Agency brief signaled both intent and growing capability. News coverage in 2004 summarized the one-page excerpt and how it raised alarms inside Washington. The core point was simple and chilling: a terror leader had both motive and a plan to target U.S. aviation, including inside the United States, a domain many believed was secure during peacetime.

How Investigators Judged the Warnings After 9/11

The 9/11 Commission later confirmed the December 1998 warning and placed it within a stream of alerts that grew louder through 2001. Commissioners wrote that agencies had warnings about al-Qaeda but did not adjust enough to the scale of the threat. They stressed that officials did not have specific information on time, place, or method that could have triggered targeted action. The result was strategic warning without the precise cues needed to stop a fast-moving plot.

Commission materials also recorded that certain high-profile reports could not be fully verified. George Tenet told the Commission the Central Intelligence Agency had not penetrated the 9/11 plot and could not corroborate some of the most dramatic threat claims, including an intent to hijack U.S. aircraft. That gap in insight mattered. Without direct access to the cell or its timeline, agencies could not match broad alerts to specific shields at airports, borders, and flight decks.

Why the System Still Failed the Public

The Commission’s staff work concluded that measures adopted from 1998 to 2001 did not disturb or delay the plotters. That finding points to a deeper systems problem familiar to both conservatives and liberals: warnings moved on paper, but action lagged, rules were rigid, and agencies worked in silos. When government treats risk as a memo to file rather than a mandate to change, citizens pay the price. That pattern fed the sense that elites protect process over public safety.

Declassified CIA Files Reveal Years of 9/11 Warnings Before the Attacks

The CIA has released 71 declassified Presidential Daily Brief products showing how U.S. intelligence tracked Osama bin Laden and al-Qaeda in the years before September 11.

One December 1998 brief warned… pic.twitter.com/o7Fv9pbCFB

— TWT UNLEASHED (@TWT_UNLEASHED) September 12, 2026

The record also shows how intelligence tradecraft can miss the step from signal to shield. Officials received many alerts about “something big” but lacked a shared playbook to test worst-case ideas and act on them. Aviation defenses did not assume hijacked planes could become weapons. Analysts flagged intent; operators did not redesign security to match. Both the right and the left can see the cost: a government that warns often, reforms slowly, and struggles to deliver basics when it counts.

What This Means Now

Today’s lesson is not only about blame. It is about building a government that can turn early signals into real protection. That means pressing agencies to share data fast, drill against dark scenarios, and empower people to act without waiting for perfect proof. It also means elected leaders must measure success by outcomes, not by briefings delivered. The public wants fewer memos and more results, especially when lives and core freedoms are at stake.