face mask cutting machine，face mask cutting machine，face mask cutting machine，face mask cutting machine， 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."The events of that morning in the US changed the nation "automatically, immediately, into one obsessed, in big ways and small, with protecting its security," wrote historian James Mann in 2018. "The way that 325 million Americans go through airports today started on September 12 and has never gone back to what it was on September 10."