(CNN) — When this century began, you could pull up to the airport 20 minutes before a domestic flight in the United States and stroll straight over to your gate. Perhaps your partner would come through security to wave you goodbye. You might not have a photo ID in your carry-on, but you could have blades and liquids.
Back in 2001, Sean O’Keefe, now a professor at Syracuse University and former chair of aerospace and defense company Airbus, was deputy director of the Office of Management and Budget in the George W. Bush administration.
“At the White House, I was a member of the National Council Security team,” he told CNN Travel. He and his colleagues had been briefed on the al Qaeda terrorist group and understood the threat it posed, “but at the same time our imaginations simply did not give us the capacity to think that something like [9/11] could happen.”
It had been nearly 30 years since Palestinian terrorist attacks at Rome airport in 1973, which killed 34 people and demonstrated that air travel was vulnerable to international terrorism. “That seemed to have changed the whole security structure in Europe and in the Middle East in a way that didn’t really penetrate the American psyche,” O’Keefe said. “It’s this typical American mindset; we have to experience it to believe it.”
Then on the morning of September 11, 2001, a team of 19 hijackers was able to board four different domestic flights in the northeastern US in a series of coordinated terror attacks that would claim 3,000 lives. Flying in America, and the rest of the world, would never be the same again.
‘Something just happened in New York City’
O’Keefe was in the White House’s West Wing with Vice President Dick Cheney when the news came through. They “had the television on, matter of fact it was CNN,” he recalled. “The phone rang. His receptionist was on the hotline to tell him to (turn the sound up); something just happened in New York City.”
Like millions of people around the world watching the same scenes live after the first plane hit the World Trade Center’s North Tower, O’Keefe and his companions assumed they were witnessing a terrible accident, a matter for the Federal Aviation Administration and the Department of Transportation.
But when the second plane hit the South Tower 17 minutes later, O’Keefe said, “That was the moment where it was really evidence that this was something more than an accident, this was a premeditated effort. The security guards, the Secret Service, all mobilized.”
‘We all had an epiphany on the same day’
Departing travelers wait in long lines in the United Airlines terminal at Chicago’s O’Hare International Airport on September 14, 2001.
Tim Boyle/Getty Images
The US government immediately began work on the security manifesto that by November 19, 2001, would be passed into law as the Aviation and Transportation Security Act.
“The fact that they had orchestrated that strike with three different flights in three different places” made clear how vulnerable the US was, O’Keefe said. “That was a real slap in the face. It reminded us how naive we had been.”
Getting agreement from Congress on security changes was fast and unanimous, he recalled. We needed “to make the resources available right away, to reinforce all those doors and cockpits (and) actually establish security perimeters.”
In airports and on airlines, meanwhile, tougher security measures were introduced as soon as civilian air travel resumed on September 14. The National Guard provided armed military personnel at airports, and travelers faced long lines as the new systems got their start.
Those early post-9/11 passengers — people who hadn’t canceled or rescheduled their trips — were, O’Keefe said, largely accepting of the new high-security regime, with its disruptions and delays. “We all had an epiphany on the same day.”
Identification checks
Some of the 9/11 hijackers had been able to board flights without proper identification. After the attacks, all passengers age 18 and over would need a valid government-issued identification in order to fly, even on domestic flights. Airports could check the ID of passengers or staff at any time to confirm that it matched the details on their boarding pass.
Before the events, the US federal government had a small list of people deemed a threat risk to air travel. However, what we know today as the No Fly List — a subset of the Terrorist Screening Database denoting people who are barred from boarding commercial aircraft for travel into, out of and inside the US — was developed in response to 9/11.
The creation of the TSA
Airport screening in the US used to be piecemeal, undertaken by private security companies appointed by airlines or airports.
As part of the new security act, the Transportation Security Administration (TSA) was introduced in November 2001. Now an agency of the US Department of Homeland Security, which was formed a year later, the TSA took over all the security functions of the FAA and US airlines and airports.
Looking back 20 years later, O’Keefe reflected that it was “an enormous challenge in that immediate time afterward to mobilize a whole new cadre of security forces, thousands of trained professionals to do this.”
“It was not without its flaws,” he added. “Recruiting issues and right training and all the things that were necessary: We went through plenty of fits and starts to make that happen.”
The fact that America’s “allies and friends and partners” around the world “had already been through this,” was a huge benefit, he said. “We were able to learn from them, how they did it and what they did.”
Security screening
Prohibited items, discovered by the TSA during screening and voluntarily abandoned by travelers, on display at Ronald Reagan Washington National Airport in May 2021.
Alex Wong/Getty Images
Before long, with the new streamlined enforcement by the TSA, potential weapons like blades, scissors and knitting needles were no longer allowed on board, and airport workers were better trained to detect weapons or explosives.
By the end of 2002, the TSA met a key mandate of the Aviation and Transportation Security Act by deploying explosives detection systems nationwide. In the following years, other terrorists attacks would further change what we could and could not bring on board planes.
Safety on board
“It used to be (that getting) into a cockpit on an American aircraft that was flying in American airspace was as easy as the doors you use to get into the (toilet),” O’Keefe recalled.
Bulletproof and locked cockpits became standard on commercial passenger aircraft within two years of 9/11.
The Arming Pilots Against Terrorism Act was signed into law in November 2002, and by the following April, the first weapon-carrying pilots were on board US commercial flights.
While aviation fans and children could once hope to get a visit to the flight deck, that dream swiftly came to an end.
“People are not welcome in the cockpit anymore, so it’s like a big secret,” Cohen said. “Now this (following pilots on Instagram) is one of the only ways people can see what’s happening.”
Passenger confidence
Boarding passes are checked at Los Angeles International Airport the day after gunman Paul Ciancia shot his way through security in November 2013.
Kevork Djansezian/Getty Images
The immediate impact of 9/11 included a big drop in travel demand. Not only had passenger confidence taken a hit, but the additional security meant the flying experience was no longer fast and hassle-free.
Speaking to CNN ahead of the 20th anniversary of 9/11, Kadiyali said, “There’s been the fall of Kabul and and all these recent events in Afghanistan (…) It did cross my mind whether people would start getting nervous about flying again.”
Delays, long lines and confusion over restrictions are also all back on the agenda in the pandemic era.
As to whether something like 9/11 could happen again, O’Keefe reflected upon the fact that the greatest achievements of Homeland Security, and of security services around the world, can never be shared with the general public.
“In the process of educating the public, what you also do is educate the terrorists,” so we will never know of all the near-misses, he said. “You almost get into a false sense of security.”
That September morning in 2001 “flipped the switch right away from almost non-existent security to unbelievable, in-your-face, all the time.”
However, two decades later, there have been no aviation-based terrorist attacks anywhere near the scale of 9/11. Said O’Keefe, “These security measures have worked.”
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