Interesting.
http://www.bbc.co.uk/news/world-us-canada-11654390
Quote:
Several cargo planes have been grounded at separate US airports as authorities investigate suspicious packages, the Transportation Security Administration has said.
An unconfirmed report by CNN said that a bomb had been discovered on a UPS flight to Chicago from Yemen when it was stopped in London.
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How regular are cargo flights and their routes? I assume you can't get a GPS signal without an external antennae but if their approach takes them over populated areas and a certain time it could be an easy way to cause mass casualties.