Last weekend's attack on Glasgow airport and a mid-week bomb scare at Heathrow's Terminal 4 seem to presage another summer of strain.
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After the Christmas airplane bomb scare, full-body scanners have been getting lots of attention as a way to make plane travel safer.
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On occasion, such as a liquid bomb scare in August 2006, the TSA has expanded the list, banning large containers of liquids and gels.
Even his 1997 Grand National victory on Lord Gyllene was overshadowed by the bomb scare which forced the race to be postponed for 48 hours.
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On occasion the TSA has expanded the list, as it did after a liquid bomb scare in August 2006 when it prohibited bringing large containers of liquids and gels on board aircraft.
He said that just after a bomb scare, he stayed with fellow student Nick Czarnek, who is part of an emerging network that uses social media to offer temporary housing for displaced students.
The TSA's current administrator, John Pistole, was serving as deputy director of the FBI during the 2006 bomb scare, and has also cited the plot as a reason for the emphasis on bombs.
The place has a feeling of uncertainty - two people at the bar, for example, are wondering whether they will be able to get back into their own hotel, closed because of a bomb scare.
During his term, the agency loosened restrictions on some items -- such as cigarette lighters, matches and small scissors -- while imposing limits on liquids and gels because of the August 2006 liquid bomb scare.
Mr. DOUGLAS: It had an effect on every level, because often, you would go to a concert or an opera and we had to get out three or four times because there was a bomb scare, real or just phoned-in hoax.
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