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There are already more police and military personnel at major international airports in Europe, the United States and around the world in response to the attacks, and travelers are being told to arrive earlier because of increased pre-flight security. That's a typical response after a terrorist attack, says aviation security expert Richard Bloom. But that's not the only answer to preventing future attacks. U.S. cities ramp up security Detecting threats well before they arrive at the airport is key. Read More "The United States and Israel have two of the best aviation security operations in the world," says Bloom, who is Embry-Riddle Aeronautical University's chief academic officer and director of terrorism,cheap jordans for sale, intelligence and security studies. "They engage in intelligence gathering operations and identify people who are a threat way before they get anywhere near the airport,cheap jordans,cheap air jordans," he says. "The farther away you handle it,cheap jordans, neutralizing the threat,cheap retro jordans,cheap retro jordans, the better off you are." Airport security