[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2009/TRAVEL/12/28/terror.alert.advice.international/t1larg.texas.security.airport.getty.jpg caption="YA TSA officer screens airline passengers at Dallas/Fort Worth International Airport December 27, 2009 in Dallas, Texas" width=416 height=234]
International air passengers face tightened security on U.S.-bound flights following the alleged attempt by Nigerian Umar Farouk Abdulmutallab to bomb a Christmas Day flight heading for Detroit.
U.S. travel and security authorities, international airlines and airports and aviation organizations have all moved quickly to implement a range of measures that will impact travelers' normal routine.
Which flights are affected by the new measures?
At present only flights to the United States are affected.
What are the measures?
The Transportation Security Administration, which oversees the security for U.S. travel, says it has issued a directive for additional security measures to be implemented for flights as they leave their last stop before the United States.
The authority has not made public the directive. But it said in a statement that passengers can expect to see extra security "at international airports such as increased gate screening including pat-downs and bag searches. During flight, passengers will be asked to follow flight crew instructions, such as stowing personal items, turning off electronic equipment and remaining seated during certain portions of the flight."
Individual airlines and airports will each interpret the TSA directive in their own way. But anecdotal advice suggests that passengers are not allowed to leave their seats for the bathroom or to access luggage during the final hour of any flight, nor keep blankets or pillows on their laps.
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